diff --git a/layout/generic/nsTextFrameUtils.cpp b/layout/generic/nsTextFrameUtils.cpp
index e814383c624c..8562839cc8b6 100644
--- a/layout/generic/nsTextFrameUtils.cpp
+++ b/layout/generic/nsTextFrameUtils.cpp
@@ -15,8 +15,7 @@
 
 using namespace mozilla;
 
-static bool
-IsDiscardable(char16_t ch, uint32_t* aFlags)
+static bool IsDiscardable(char16_t ch, uint32_t* aFlags)
 {
   // Unlike IS_DISCARDABLE, we don't discard \r. \r will be ignored by gfxTextRun
   // and discarding it would force us to copy text in many cases of preformatted
@@ -28,8 +27,7 @@ IsDiscardable(char16_t ch, uint32_t* aFlags)
   return IsBidiControl(ch);
 }
 
-static bool
-IsDiscardable(uint8_t ch, uint32_t* aFlags)
+static bool IsDiscardable(uint8_t ch, uint32_t* aFlags)
 {
   if (ch == CH_SHY) {
     *aFlags |= nsTextFrameUtils::TEXT_HAS_SHY;
@@ -38,159 +36,25 @@ IsDiscardable(uint8_t ch, uint32_t* aFlags)
   return false;
 }
 
-static bool
-IsSegmentBreak(char16_t aCh)
-{
-  return aCh == '\n' || aCh == '\r';
-}
-
-static bool
-IsSpaceOrTab(char16_t aCh)
-{
-  return aCh == ' ' || aCh == '\t';
-}
-
-static bool
-IsSpaceOrTabOrSegmentBreak(char16_t aCh)
-{
-  return IsSpaceOrTab(aCh) || IsSegmentBreak(aCh);
-}
-
-template<class CharT>
-static CharT*
-TransformWhiteSpaces(const CharT* aText, uint32_t aLength,
-                     uint32_t aBegin, uint32_t aEnd,
-                     bool aHasSegmentBreak,
-                     bool& aInWhitespace,
-                     CharT* aOutput,
-                     uint32_t& aFlags,
-                     nsTextFrameUtils::CompressionMode aCompression,
-                     gfxSkipChars* aSkipChars)
-{
-  MOZ_ASSERT(aCompression == nsTextFrameUtils::COMPRESS_WHITESPACE ||
-             aCompression == nsTextFrameUtils::COMPRESS_WHITESPACE_NEWLINE,
-             "whitespaces should be skippable!!");
-  // Get the context preceding/following this white space range.
-  // For 8-bit text (sizeof CharT == 1), the checks here should get optimized
-  // out, and isSegmentBreakSkippable should be initialized to be 'false'.
-  bool isSegmentBreakSkippable =
-    sizeof(CharT) > 1 &&
-    ((aBegin > 0 && IS_ZERO_WIDTH_SPACE(aText[aBegin - 1])) ||
-     (aEnd < aLength && IS_ZERO_WIDTH_SPACE(aText[aEnd])));
-  if (sizeof(CharT) > 1 && !isSegmentBreakSkippable &&
-      aBegin > 0 && aEnd < aLength) {
-    uint32_t ucs4before;
-    uint32_t ucs4after;
-    if (aBegin > 1 &&
-        NS_IS_LOW_SURROGATE(aText[aBegin - 1]) &&
-        NS_IS_HIGH_SURROGATE(aText[aBegin - 2])) {
-      ucs4before = SURROGATE_TO_UCS4(aText[aBegin - 2], aText[aBegin - 1]);
-    } else {
-      ucs4before = aText[aBegin - 1];
-    }
-    if (aEnd + 1 < aLength &&
-        NS_IS_HIGH_SURROGATE(aText[aEnd]) &&
-        NS_IS_LOW_SURROGATE(aText[aEnd + 1])) {
-      ucs4after = SURROGATE_TO_UCS4(aText[aEnd], aText[aEnd + 1]);
-    } else {
-      ucs4after = aText[aEnd];
-    }
-    // Discard newlines between characters that have F, W, or H
-    // EastAsianWidth property and neither side is Hangul.
-    isSegmentBreakSkippable = IsSegmentBreakSkipChar(ucs4before) &&
-                              IsSegmentBreakSkipChar(ucs4after);
-  }
-
-  for (uint32_t i = aBegin; i < aEnd; ++i) {
-    CharT ch = aText[i];
-    bool keepChar = false;
-    bool keepTransformedWhiteSpace = false;
-    if (IsDiscardable(ch, &aFlags)) {
-      aSkipChars->SkipChar();
-      continue;
-    }
-    if (IsSpaceOrTab(ch)) {
-      if (aHasSegmentBreak) {
-        // If white-space is set to normal, nowrap, or pre-line, white space
-        // characters are considered collapsible and all spaces and tabs
-        // immediately preceding or following a segment break are removed.
-        aSkipChars->SkipChar();
-        continue;
-      }
-
-      if (aInWhitespace) {
-        aSkipChars->SkipChar();
-        continue;
-      } else {
-        keepTransformedWhiteSpace = true;
-      }
-    } else {
-      // Apply Segment Break Transformation Rules (CSS Text 3 - 4.1.2) for
-      // segment break characters.
-      if (aCompression == nsTextFrameUtils::COMPRESS_WHITESPACE ||
-          // XXX: According to CSS Text 3, a lone CR should not always be
-          //      kept, but still go through the Segment Break Transformation
-          //      Rules. However, this is what current modern browser engines
-          //      (webkit/blink/edge) do. So, once we can get some clarity
-          //      from the specification issue, we should either remove the
-          //      lone CR condition here, or leave it here with this comment
-          //      being rephrased.
-          //      Please see https://github.com/w3c/csswg-drafts/issues/855.
-          ch == '\r') {
-        keepChar = true;
-      } else {
-        // aCompression == COMPRESS_WHITESPACE_NEWLINE
-
-        // Any collapsible segment break immediately following another
-        // collapsible segment break is removed.  Then the remaining segment
-        // break is either transformed into a space (U+0020) or removed
-        // depending on the context before and after the break.
-        if (isSegmentBreakSkippable || aInWhitespace) {
-          aSkipChars->SkipChar();
-          continue;
-        }
-        isSegmentBreakSkippable = true;
-        keepTransformedWhiteSpace = true;
-      }
-    }
-
-    if (keepChar) {
-      *aOutput++ = ch;
-      aSkipChars->KeepChar();
-      aInWhitespace = IsSpaceOrTab(ch);
-    } else if (keepTransformedWhiteSpace) {
-      if (ch != ' ') {
-        aFlags |= nsTextFrameUtils::TEXT_WAS_TRANSFORMED;
-      }
-      *aOutput++ = ' ';
-      aSkipChars->KeepChar();
-      aInWhitespace = true;
-    } else {
-      MOZ_ASSERT_UNREACHABLE("Should've skipped the character!!");
-    }
-  }
-  return aOutput;
-}
-
-template<class CharT>
-CharT*
-nsTextFrameUtils::TransformText(const CharT* aText, uint32_t aLength,
-                                CharT* aOutput,
+char16_t*
+nsTextFrameUtils::TransformText(const char16_t* aText, uint32_t aLength,
+                                char16_t* aOutput,
                                 CompressionMode aCompression,
                                 uint8_t* aIncomingFlags,
                                 gfxSkipChars* aSkipChars,
                                 uint32_t* aAnalysisFlags)
 {
   uint32_t flags = 0;
-  CharT* outputStart = aOutput;
+  char16_t* outputStart = aOutput;
 
   bool lastCharArabic = false;
+
   if (aCompression == COMPRESS_NONE ||
       aCompression == COMPRESS_NONE_TRANSFORM_TO_SPACE) {
     // Skip discardables.
     uint32_t i;
     for (i = 0; i < aLength; ++i) {
-      CharT ch = aText[i];
+      char16_t ch = aText[i];
       if (IsDiscardable(ch, &flags)) {
         aSkipChars->SkipChar();
       } else {
@@ -221,72 +85,68 @@ nsTextFrameUtils::TransformText(const CharT* aText, uint32_t aLength,
     bool inWhitespace = (*aIncomingFlags & INCOMING_WHITESPACE) != 0;
     uint32_t i;
     for (i = 0; i < aLength; ++i) {
-      CharT ch = aText[i];
-      // CSS Text 3 - 4.1. The White Space Processing Rules
-      // White space processing in CSS affects only the document white space
-      // characters: spaces (U+0020), tabs (U+0009), and segment breaks.
-      // Since we need the context of segment breaks and their surrounding
-      // white spaces to proceed the white space processing, a consecutive run
-      // of spaces/tabs/segment breaks is collected in a first pass loop, then
-      // we apply the collapsing and transformation rules to this run in a
-      // second pass loop.
-      if (IsSpaceOrTabOrSegmentBreak(ch)) {
-        bool keepLastSpace = false;
-        bool hasSegmentBreak = IsSegmentBreak(ch);
-        uint32_t countTrailingDiscardables = 0;
-        uint32_t j;
-        for (j = i + 1; j < aLength &&
-                        (IsSpaceOrTabOrSegmentBreak(aText[j]) ||
-                         IsDiscardable(aText[j], &flags));
-             j++) {
-          if (IsSegmentBreak(aText[j])) {
-            hasSegmentBreak = true;
+      char16_t ch = aText[i];
+      bool nowInWhitespace;
+      if (ch == ' ' &&
+          (i + 1 >= aLength ||
+           !IsSpaceCombiningSequenceTail(&aText[i + 1], aLength - (i + 1)))) {
+        nowInWhitespace = true;
+      } else if (ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE) {
+        if ((i > 0 && IS_ZERO_WIDTH_SPACE(aText[i - 1])) ||
+            (i + 1 < aLength && IS_ZERO_WIDTH_SPACE(aText[i + 1]))) {
+          aSkipChars->SkipChar();
+          continue;
+        }
+        uint32_t ucs4before;
+        uint32_t ucs4after;
+        if (i > 1 &&
+            NS_IS_LOW_SURROGATE(aText[i - 1]) &&
+            NS_IS_HIGH_SURROGATE(aText[i - 2])) {
+          ucs4before = SURROGATE_TO_UCS4(aText[i - 2], aText[i - 1]);
+        } else if (i > 0) {
+          ucs4before = aText[i - 1];
+        }
+        if (i + 2 < aLength &&
+            NS_IS_HIGH_SURROGATE(aText[i + 1]) &&
+            NS_IS_LOW_SURROGATE(aText[i + 2])) {
+          ucs4after = SURROGATE_TO_UCS4(aText[i + 1], aText[i + 2]);
+        } else if (i + 1 < aLength) {
+          ucs4after = aText[i + 1];
+        }
+        if (i > 0 && IsSegmentBreakSkipChar(ucs4before) &&
+            i + 1 < aLength && IsSegmentBreakSkipChar(ucs4after)) {
+          // Discard newlines between characters that have F, W, or H
+          // EastAsianWidth property and neither side is Hangul.
+          aSkipChars->SkipChar();
+          continue;
+        }
+        nowInWhitespace = true;
+      } else {
+        nowInWhitespace = ch == '\t';
+      }
+
+      if (!nowInWhitespace) {
+        if (IsDiscardable(ch, &flags)) {
+          aSkipChars->SkipChar();
+          nowInWhitespace = inWhitespace;
+        } else {
+          *aOutput++ = ch;
+          aSkipChars->KeepChar();
+          lastCharArabic = IS_ARABIC_CHAR(ch);
+        }
+      } else {
+        if (inWhitespace) {
+          aSkipChars->SkipChar();
+        } else {
+          if (ch != ' ') {
+            flags |= TEXT_WAS_TRANSFORMED;
           }
-        }
-        // Exclude trailing discardables before checking space combining
-        // sequence tail.
-        for (; IsDiscardable(aText[j - 1], &flags); j--) {
-          countTrailingDiscardables++;
-        }
-        // If the last white space is followed by a combining sequence tail,
-        // exclude it from the range of TransformWhiteSpaces.
-        if (sizeof(CharT) > 1 && aText[j - 1] == ' ' && j < aLength &&
-            IsSpaceCombiningSequenceTail(&aText[j], aLength - j)) {
-          keepLastSpace = true;
-          j--;
-        }
-        if (j > i) {
-          aOutput = TransformWhiteSpaces(aText, aLength, i, j, hasSegmentBreak,
-                                         inWhitespace, aOutput, flags,
-                                         aCompression, aSkipChars);
-        }
-        // We need to keep KeepChar()/SkipChar() in order, so process the
-        // last white space first, then process the trailing discardables.
-        if (keepLastSpace) {
-          keepLastSpace = false;
           *aOutput++ = ' ';
           aSkipChars->KeepChar();
-          lastCharArabic = false;
-          j++;
         }
-        for (; countTrailingDiscardables > 0; countTrailingDiscardables--) {
-          aSkipChars->SkipChar();
-          j++;
-        }
-        i = j - 1;
-        continue;
       }
-      // Process characters other than the document white space characters.
-      if (IsDiscardable(ch, &flags)) {
-        aSkipChars->SkipChar();
-      } else {
-        *aOutput++ = ch;
-        aSkipChars->KeepChar();
-      }
-      lastCharArabic = IS_ARABIC_CHAR(ch);
-      inWhitespace = false;
+      inWhitespace = nowInWhitespace;
     }
-
     if (lastCharArabic) {
       *aIncomingFlags |= INCOMING_ARABICCHAR;
     } else {
@@ -305,28 +165,85 @@ nsTextFrameUtils::TransformText(const CharT* aText, uint32_t aLength,
   *aAnalysisFlags = flags;
   return aOutput;
 }
-/*
- * NOTE: This template is part of public API of nsTextFrameUtils, while
- * its function body is not available in the header. It may stop working
- * (fail to resolve symbol in link time) once its callsites are moved to a
- * different translation unit (e.g. a different unified source file).
- * Explicit instantiating this function template with `uint8_t` and `char16_t`
- * could prevent us from the potential risk.
- */
-template uint8_t*
+
+uint8_t*
 nsTextFrameUtils::TransformText(const uint8_t* aText, uint32_t aLength,
                                 uint8_t* aOutput,
                                 CompressionMode aCompression,
                                 uint8_t* aIncomingFlags,
                                 gfxSkipChars* aSkipChars,
-                                uint32_t* aAnalysisFlags);
-template char16_t*
-nsTextFrameUtils::TransformText(const char16_t* aText, uint32_t aLength,
-                                char16_t* aOutput,
-                                CompressionMode aCompression,
-                                uint8_t* aIncomingFlags,
-                                gfxSkipChars* aSkipChars,
-                                uint32_t* aAnalysisFlags);
+                                uint32_t* aAnalysisFlags)
+{
+  uint32_t flags = 0;
+  uint8_t* outputStart = aOutput;
+
+  if (aCompression == COMPRESS_NONE ||
+      aCompression == COMPRESS_NONE_TRANSFORM_TO_SPACE) {
+    // Skip discardables.
+    uint32_t i;
+    for (i = 0; i < aLength; ++i) {
+      uint8_t ch = aText[i];
+      if (IsDiscardable(ch, &flags)) {
+        aSkipChars->SkipChar();
+      } else {
+        aSkipChars->KeepChar();
+        if (aCompression == COMPRESS_NONE_TRANSFORM_TO_SPACE) {
+          if (ch == '\t' || ch == '\n') {
+            ch = ' ';
+            flags |= TEXT_WAS_TRANSFORMED;
+          }
+        } else {
+          // aCompression == COMPRESS_NONE
+          if (ch == '\t') {
+            flags |= TEXT_HAS_TAB;
+          }
+        }
+        *aOutput++ = ch;
+      }
+    }
+    *aIncomingFlags &= ~(INCOMING_ARABICCHAR | INCOMING_WHITESPACE);
+  } else {
+    bool inWhitespace = (*aIncomingFlags & INCOMING_WHITESPACE) != 0;
+    uint32_t i;
+    for (i = 0; i < aLength; ++i) {
+      uint8_t ch = aText[i];
+      bool nowInWhitespace = ch == ' ' || ch == '\t' ||
+        (ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE);
+      if (!nowInWhitespace) {
+        if (IsDiscardable(ch, &flags)) {
+          aSkipChars->SkipChar();
+          nowInWhitespace = inWhitespace;
+        } else {
+          *aOutput++ = ch;
+          aSkipChars->KeepChar();
+        }
+      } else {
+        if (inWhitespace) {
+          aSkipChars->SkipChar();
+        } else {
+          if (ch != ' ') {
+            flags |= TEXT_WAS_TRANSFORMED;
+          }
+          *aOutput++ = ' ';
+          aSkipChars->KeepChar();
+        }
+      }
+      inWhitespace = nowInWhitespace;
+    }
+    *aIncomingFlags &= ~INCOMING_ARABICCHAR;
+    if (inWhitespace) {
+      *aIncomingFlags |= INCOMING_WHITESPACE;
+    } else {
+      *aIncomingFlags &= ~INCOMING_WHITESPACE;
+    }
+  }
+
+  if (outputStart + aLength != aOutput) {
+    flags |= TEXT_WAS_TRANSFORMED;
+  }
+  *aAnalysisFlags = flags;
+  return aOutput;
+}
 
 uint32_t
 nsTextFrameUtils::ComputeApproximateLengthWithWhitespaceCompression(
diff --git a/layout/generic/nsTextFrameUtils.h b/layout/generic/nsTextFrameUtils.h
index 22c232f17121..eecc0d93f22d 100644
--- a/layout/generic/nsTextFrameUtils.h
+++ b/layout/generic/nsTextFrameUtils.h
@@ -87,10 +87,6 @@ public:
        )
       );
   }
-  static bool
-  IsSpaceCombiningSequenceTail(const uint8_t* aChars, int32_t aLength) {
-    return false;
-  }
 
   enum CompressionMode {
     COMPRESS_NONE,
@@ -104,7 +100,7 @@ public:
    * compressed. A preformatted tab is sent to the text run as a single space.
    * (Tab spacing must be performed by textframe later.) Certain other
    * characters are discarded.
-   *
+   * 
    * @param aCompression control what is compressed to a
    * single space character: no compression, compress spaces (not followed
    * by combining mark) and tabs, compress those plus newlines, or
@@ -113,13 +109,19 @@ public:
    * or an Arabic character preceding this text. We set it to indicate if
    * there's an Arabic character or whitespace preceding the end of this text.
    */
-  template<class CharT>
-  static CharT* TransformText(const CharT* aText, uint32_t aLength,
-                              CharT* aOutput,
-                              CompressionMode aCompression,
-                              uint8_t* aIncomingFlags,
-                              gfxSkipChars* aSkipChars,
-                              uint32_t* aAnalysisFlags);
+  static char16_t* TransformText(const char16_t* aText, uint32_t aLength,
+                                 char16_t* aOutput,
+                                 CompressionMode aCompression,
+                                 uint8_t* aIncomingFlags,
+                                 gfxSkipChars* aSkipChars,
+                                 uint32_t* aAnalysisFlags);
+
+  static uint8_t* TransformText(const uint8_t* aText, uint32_t aLength,
+                                uint8_t* aOutput,
+                                CompressionMode aCompression,
+                                uint8_t* aIncomingFlags,
+                                gfxSkipChars* aSkipChars,
+                                uint32_t* aAnalysisFlags);
 
   static void
   AppendLineBreakOffset(nsTArray<uint32_t>* aArray, uint32_t aOffset)
diff --git a/layout/reftests/w3c-css/submitted/text3/reftest.list b/layout/reftests/w3c-css/submitted/text3/reftest.list
index 8c532eaf7d34..2712e4363bba 100644
--- a/layout/reftests/w3c-css/submitted/text3/reftest.list
+++ b/layout/reftests/w3c-css/submitted/text3/reftest.list
@@ -6,62 +6,3 @@
 == text-align-match-parent-root-rtl.html text-align-match-parent-root-rtl-ref.html
 
 == text-word-spacing-001.html text-word-spacing-ref.html
-
-== segment-break-transformation-removable-1.html segment-break-transformation-removable-ref.html
-== segment-break-transformation-removable-2.html segment-break-transformation-removable-ref.html
-== segment-break-transformation-removable-3.html segment-break-transformation-removable-ref.html
-== segment-break-transformation-removable-4.html segment-break-transformation-removable-ref.html
-== segment-break-transformation-unremovable-1.html segment-break-transformation-unremovable-ref.html
-== segment-break-transformation-unremovable-2.html segment-break-transformation-unremovable-ref.html
-== segment-break-transformation-unremovable-3.html segment-break-transformation-unremovable-ref.html
-== segment-break-transformation-unremovable-4.html segment-break-transformation-unremovable-ref.html
-
-== segment-break-transformation-rules-001.html segment-break-transformation-rules-001-ref.html
-== segment-break-transformation-rules-002.html segment-break-transformation-rules-002-ref.html
-== segment-break-transformation-rules-003.html segment-break-transformation-rules-003-ref.html
-== segment-break-transformation-rules-004.html segment-break-transformation-rules-004-ref.html
-== segment-break-transformation-rules-005.html segment-break-transformation-rules-005-ref.html
-== segment-break-transformation-rules-006.html segment-break-transformation-rules-006-ref.html
-== segment-break-transformation-rules-007.html segment-break-transformation-rules-007-ref.html
-== segment-break-transformation-rules-008.html segment-break-transformation-rules-008-ref.html
-== segment-break-transformation-rules-009.html segment-break-transformation-rules-009-ref.html
-== segment-break-transformation-rules-010.html segment-break-transformation-rules-010-ref.html
-== segment-break-transformation-rules-011.html segment-break-transformation-rules-011-ref.html
-== segment-break-transformation-rules-012.html segment-break-transformation-rules-012-ref.html
-== segment-break-transformation-rules-013.html segment-break-transformation-rules-013-ref.html
-== segment-break-transformation-rules-014.html segment-break-transformation-rules-014-ref.html
-== segment-break-transformation-rules-015.html segment-break-transformation-rules-015-ref.html
-== segment-break-transformation-rules-016.html segment-break-transformation-rules-016-ref.html
-== segment-break-transformation-rules-017.html segment-break-transformation-rules-017-ref.html
-== segment-break-transformation-rules-018.html segment-break-transformation-rules-018-ref.html
-== segment-break-transformation-rules-019.html segment-break-transformation-rules-019-ref.html
-== segment-break-transformation-rules-020.html segment-break-transformation-rules-020-ref.html
-== segment-break-transformation-rules-021.html segment-break-transformation-rules-021-ref.html
-== segment-break-transformation-rules-022.html segment-break-transformation-rules-022-ref.html
-== segment-break-transformation-rules-023.html segment-break-transformation-rules-023-ref.html
-== segment-break-transformation-rules-024.html segment-break-transformation-rules-024-ref.html
-== segment-break-transformation-rules-025.html segment-break-transformation-rules-025-ref.html
-== segment-break-transformation-rules-026.html segment-break-transformation-rules-026-ref.html
-== segment-break-transformation-rules-027.html segment-break-transformation-rules-027-ref.html
-== segment-break-transformation-rules-028.html segment-break-transformation-rules-028-ref.html
-== segment-break-transformation-rules-029.html segment-break-transformation-rules-029-ref.html
-== segment-break-transformation-rules-030.html segment-break-transformation-rules-030-ref.html
-== segment-break-transformation-rules-031.html segment-break-transformation-rules-031-ref.html
-== segment-break-transformation-rules-032.html segment-break-transformation-rules-032-ref.html
-== segment-break-transformation-rules-033.html segment-break-transformation-rules-033-ref.html
-== segment-break-transformation-rules-034.html segment-break-transformation-rules-034-ref.html
-== segment-break-transformation-rules-035.html segment-break-transformation-rules-035-ref.html
-== segment-break-transformation-rules-036.html segment-break-transformation-rules-036-ref.html
-== segment-break-transformation-rules-037.html segment-break-transformation-rules-037-ref.html
-== segment-break-transformation-rules-038.html segment-break-transformation-rules-038-ref.html
-== segment-break-transformation-rules-039.html segment-break-transformation-rules-039-ref.html
-== segment-break-transformation-rules-040.html segment-break-transformation-rules-040-ref.html
-== segment-break-transformation-rules-041.html segment-break-transformation-rules-041-ref.html
-== segment-break-transformation-rules-042.html segment-break-transformation-rules-042-ref.html
-== segment-break-transformation-rules-043.html segment-break-transformation-rules-043-ref.html
-== segment-break-transformation-rules-044.html segment-break-transformation-rules-044-ref.html
-== segment-break-transformation-rules-045.html segment-break-transformation-rules-045-ref.html
-== segment-break-transformation-rules-046.html segment-break-transformation-rules-046-ref.html
-== segment-break-transformation-rules-047.html segment-break-transformation-rules-047-ref.html
-== segment-break-transformation-rules-048.html segment-break-transformation-rules-048-ref.html
-== segment-break-transformation-rules-049.html segment-break-transformation-rules-049-ref.html
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-1.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-1.html
deleted file mode 100644
index 913529808647..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-1.html
+++ /dev/null
@@ -1,28 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-removable-ref.html">
-<meta name="assert" content="Test checks that a collapsible segment break should be removed correctly,
-if the character immediately before/after the segment break is the zero-width space character (U+200B),
-or both the character before/after the segment break is F, W, or H (not A), and neither side is Hangul.">
-<style> p { line-height: 1; font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>no</b> white space between 2nd and 3rd CJK character.
-<!--Some[LF]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][LF]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x000a;&#x4e2d;&#x6587;</p>
-<!--Some[LF][ZWSP]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#x200b;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][LF]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x000a;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-2.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-2.html
deleted file mode 100644
index 0ff5b0b0d403..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-2.html
+++ /dev/null
@@ -1,28 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-removable-ref.html">
-<meta name="assert" content="Test checks that multiple segment breaks should be removed correctly,
-if the character immediately before/after the segment breaks is the zero-width space character (U+200B),
-or both the character before/after the segment breaks is F, W, or H (not A), and neither side is Hangul.">
-<style> p { line-height: 1; font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>no</b> white space between 2nd and 3rd CJK character.
-<!--Some[LF][LF][LF]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#x000a;&#x000a;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][LF][LF][LF]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x000a;&#x000a;&#x000a;&#x4e2d;&#x6587;</p>
-<!--Some[LF][LF][LF][ZWSP]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#x000a;&#x000a;&#x200b;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][LF][LF][LF]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x000a;&#x000a;&#x000a;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-3.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-3.html
deleted file mode 100644
index 25f8aac430ac..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-3.html
+++ /dev/null
@@ -1,29 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-removable-ref.html">
-<meta name="assert" content="Test checks that a sequence which consists of a collapsible segment break
-surrounded by multiple white spaces should be removed correctly,
-if the character immediately before/after the sequence is the zero-width space character (U+200B),
-or both the character before/after the sequence is F, W, or H (not A), and neither side is Hangul.">
-<style> p { line-height: 1; font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>no</b> white space between 2nd and 3rd CJK character.
-<!--Some[WS][WS][LF][WS][WS]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x0020;&#x000a;&#x0020;&#x0020;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][WS][WS][LF][WS][WS]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x0020;&#x0020;&#x000a;&#x0020;&#x0020;&#x4e2d;&#x6587;</p>
-<!--Some[WS][WS][LF][WS][WS][ZWSP]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x0020;&#x000a;&#x0020;&#x0020;&#x200b;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][WS][WS][LF][WS][WS]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x0020;&#x0020;&#x000a;&#x0020;&#x0020;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-4.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-4.html
deleted file mode 100644
index b6284c0b8cb2..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-4.html
+++ /dev/null
@@ -1,29 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-removable-ref.html">
-<meta name="assert" content="Test checks that a sequence which consists of multiple collapsible
-segment breaks mixed with multiple white spaces should be removed correctly,
-if the character immediately before/after the sequence is the zero-width space character (U+200B),
-or both the character before/after the sequence is F, W, or H (not A), and neither side is Hangul.">
-<style> p { line-height: 1; font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>no</b> white space between 2nd and 3rd CJK character.
-<!--Some[WS][LF][WS][LF][WS][LF][WS]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][WS][LF][WS][LF][WS][LF][WS]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x4e2d;&#x6587;</p>
-<!--Some[WS][LF][WS][LF][WS][LF][WS][ZWSP]Chinese-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x200b;&#x4e2d;&#x6587;</p>
-<!--Some[ZWSP][WS][LF][WS][LF][WS][LF][WS]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x200b;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-ref.html
deleted file mode 100644
index 5964fa593df3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-removable-ref.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { line-height: 1; font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>no</b> white space between 2nd and 3rd CJK character.
-<!--Some Chinese-->
-<p>&#x4e00;&#x4e9b;&#x4e2d;&#x6587;</p>
-<!--Some Chinese-->
-<p>&#x4e00;&#x4e9b;&#x4e2d;&#x6587;</p>
-<!--Some Chinese-->
-<p>&#x4e00;&#x4e9b;&#x4e2d;&#x6587;</p>
-<!--Some Hangul-->
-<p>&#x4e00;&#x4e9b;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001-ref.html
deleted file mode 100644
index f66bccefcb75..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001.html
deleted file mode 100644
index 494f9f2dbfdb..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-001.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-001-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002-ref.html
deleted file mode 100644
index b01ea124e4a9..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002.html
deleted file mode 100644
index 90db29adef33..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-002.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-002-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003-ref.html
deleted file mode 100644
index c82aa1c18462..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003.html
deleted file mode 100644
index efc7b6024416..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-003.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-003-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004-ref.html
deleted file mode 100644
index 5b94f905d348..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004.html
deleted file mode 100644
index ba21e80989b8..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-004.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-004-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005-ref.html
deleted file mode 100644
index 7899dbaa0e78..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005.html
deleted file mode 100644
index c45b706455a7..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-005.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-005-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006-ref.html
deleted file mode 100644
index 02845041f154..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006.html
deleted file mode 100644
index 7906002ad721..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-006.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-006-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007-ref.html
deleted file mode 100644
index 82a674ba2bb7..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007.html
deleted file mode 100644
index ffeb131275df..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-007.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Full-width (F)/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-007-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ＦＵＬＬＷＩＤＴＨ&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008-ref.html
deleted file mode 100644
index fdb0abe18be3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008.html
deleted file mode 100644
index c4d016835e70..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-008.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-008-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009-ref.html
deleted file mode 100644
index 225a033ea36f..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009.html
deleted file mode 100644
index 7b3fa31adac5..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-009.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-009-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010-ref.html
deleted file mode 100644
index ff1f441f83e2..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄ測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010.html
deleted file mode 100644
index a4aa917b551a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-010.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-010-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011-ref.html
deleted file mode 100644
index 5df8d43d2e4a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011.html
deleted file mode 100644
index 25fae5d0aa6e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-011.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-011-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012-ref.html
deleted file mode 100644
index dfec0f4646a3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012.html
deleted file mode 100644
index cddc783f2ef0..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-012.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-012-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013-ref.html
deleted file mode 100644
index b0b9ad58b9eb..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013.html
deleted file mode 100644
index 3157f7f7c0ec..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-013.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-013-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014-ref.html
deleted file mode 100644
index 040b4410b34d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014.html
deleted file mode 100644
index 732ed7e074e2..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-014.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Half-width (H)/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-014-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>ﾃｽﾄ&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015-ref.html
deleted file mode 100644
index 2a2815893292..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015.html
deleted file mode 100644
index d9cf41cf2947..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-015.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-015-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016-ref.html
deleted file mode 100644
index 339aaa4ab9cb..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016.html
deleted file mode 100644
index f61b08c16ac6..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-016.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-016-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017-ref.html
deleted file mode 100644
index ede6f889dad1..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017.html
deleted file mode 100644
index 6fc77afd453e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-017.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-017-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>測試&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018-ref.html
deleted file mode 100644
index a4ac3be9762e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018.html
deleted file mode 100644
index b8fa0fe94a2a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-018.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-018-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019-ref.html
deleted file mode 100644
index a4106d7bd3e2..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019.html
deleted file mode 100644
index 916307b50a5c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-019.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-019-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020-ref.html
deleted file mode 100644
index 95224a24a84e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020.html
deleted file mode 100644
index 91aaa4648a96..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-020.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-020-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021-ref.html
deleted file mode 100644
index 55c414a206f2..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021.html
deleted file mode 100644
index d8be051ae33c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-021.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Wide (W) except Hangul/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-021-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>測試&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022-ref.html
deleted file mode 100644
index 1dc537bc341d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022.html
deleted file mode 100644
index c6a64144934c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-022.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-022-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023-ref.html
deleted file mode 100644
index 0fe815bbebb3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023.html
deleted file mode 100644
index 09d6ea4e37d0..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-023.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-023-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024-ref.html
deleted file mode 100644
index 096aab333daa..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024.html
deleted file mode 100644
index 72c5cefda255..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-024.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-024-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025-ref.html
deleted file mode 100644
index 1e797d5194e8..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025.html
deleted file mode 100644
index 54b5c8f85af3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-025.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-025-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026-ref.html
deleted file mode 100644
index 269ef7a4f19e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026.html
deleted file mode 100644
index 90e82b7d1e40..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-026.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-026-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027-ref.html
deleted file mode 100644
index bf678c7c20fe..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027.html
deleted file mode 100644
index 9ade4003566f..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-027.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-027-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028-ref.html
deleted file mode 100644
index 642e21f334d1..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028.html
deleted file mode 100644
index 927e652e8dc6..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-028.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Narrow (Na)/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-028-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>narrow&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029-ref.html
deleted file mode 100644
index 69b43f61e705..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029.html
deleted file mode 100644
index 0c0a066fcd8d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-029.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-029-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030-ref.html
deleted file mode 100644
index 3c3cc2658a43..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030.html
deleted file mode 100644
index fad7d22abf8d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-030.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-030-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031-ref.html
deleted file mode 100644
index 4902bf1e7848..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031.html
deleted file mode 100644
index 3b6916cd8ebd..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-031.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-031-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032-ref.html
deleted file mode 100644
index a2bd3b472b9b..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032.html
deleted file mode 100644
index fdb3670efe0c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-032.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-032-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033-ref.html
deleted file mode 100644
index 0b3ab3e92868..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033.html
deleted file mode 100644
index de2af2fdf9bb..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-033.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-033-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034-ref.html
deleted file mode 100644
index 3c55aa257b1c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034.html
deleted file mode 100644
index b6e4ea7756b3..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-034.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-034-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035-ref.html
deleted file mode 100644
index 5160d4a7c9fe..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035.html
deleted file mode 100644
index 816de856b550..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-035.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with East Asian Ambiguous (A)/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-035-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>■&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036-ref.html
deleted file mode 100644
index f15f8c68530a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036.html
deleted file mode 100644
index 993dcabaddfd..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-036.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-036-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037-ref.html
deleted file mode 100644
index 9716239f3de6..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037.html
deleted file mode 100644
index 25003a8eae2d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-037.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-037-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038-ref.html
deleted file mode 100644
index a24b5d429690..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038.html
deleted file mode 100644
index 49907c5007c6..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-038.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-038-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039-ref.html
deleted file mode 100644
index b20aa3ba938f..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039.html
deleted file mode 100644
index ac6f153e4d95..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-039.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-039-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040-ref.html
deleted file mode 100644
index 1efeb6813289..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040.html
deleted file mode 100644
index 78c5f7282862..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-040.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-040-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041-ref.html
deleted file mode 100644
index 21fe9aa30519..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041.html
deleted file mode 100644
index 7315d074071d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-041.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-041-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042-ref.html
deleted file mode 100644
index f164d1bd3b7e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042.html
deleted file mode 100644
index dc3b85c1758e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-042.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Not East Asian (Neutral)/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-042-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>آزمون&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043-ref.html
deleted file mode 100644
index 657ea9dd04fd..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043.html
deleted file mode 100644
index 327c9aa748a0..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-043.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/East Asian Full-width (F) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-043-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;ＦＵＬＬＷＩＤＴＨ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044-ref.html
deleted file mode 100644
index 93cb2234e73b..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044.html
deleted file mode 100644
index 4b0a468d767d..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-044.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/East Asian Half-width (H) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-044-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;ﾃｽﾄ</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045-ref.html
deleted file mode 100644
index 7839b74dad4c..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045.html
deleted file mode 100644
index ab6376964253..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-045.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/East Asian Wide (W) except Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-045-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;測試</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046-ref.html
deleted file mode 100644
index 5a457be71b33..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046.html
deleted file mode 100644
index dac5830248da..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-046.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/East Asian Narrow (Na) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-046-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;narrow</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047-ref.html
deleted file mode 100644
index c3e890c66b12..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047.html
deleted file mode 100644
index 60897786b44e..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-047.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/East Asian Ambiguous (A) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-047-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;■</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048-ref.html
deleted file mode 100644
index e27b09d3fad1..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048.html
deleted file mode 100644
index 60a2f7f6db77..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-048.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/Not East Asian (Neutral) in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-048-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;آزمون</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049-ref.html
deleted file mode 100644
index f1cce478a10a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049-ref.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x0020;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049.html
deleted file mode 100644
index 5fddc1a0e408..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-rules-049.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with Hangul/Hangul in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-049-ref.html">
-<style> p { font-family: ahem; } </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>테스트&#x000a;테스트</p>
-</div>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-1.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-1.html
deleted file mode 100644
index 4af93c96eeb7..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-1.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-unremovable-ref.html">
-<meta name="assert" content="Test checks that a collapsible segment break should be converted to a white space (U+0020),
-if both the character before/after the segment break is Hangul.">
-<style> p { font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>one</b> white space between 2nd and 3rd CJK character.
-<!--Some[LF]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-2.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-2.html
deleted file mode 100644
index 88bbcba94a63..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-2.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-unremovable-ref.html">
-<meta name="assert" content="Test checks that multiple segment breaks should be converted to a white space (U+0020),
-if both the character before/after the segment breaks is Hangul.">
-<style> p { font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>one</b> white space between 2nd and 3rd CJK character.
-<!--Some[LF][LF][LF]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x000a;&#x000a;&#x000a;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-3.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-3.html
deleted file mode 100644
index e1d28d13f4e0..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-3.html
+++ /dev/null
@@ -1,22 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-unremovable-ref.html">
-<meta name="assert" content="Test checks that a sequence which consists of a collapsible segment break
-surrounded by multiple white spaces should be converted to a white space (U+0020),
-if both the character before/after the sequence is Hangul.">
-<style> p { font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>one</b> white space between 2nd and 3rd CJK character.
-<!--Some[WS][WS][LF][WS][WS]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x0020;&#x000a;&#x0020;&#x0020;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-4.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-4.html
deleted file mode 100644
index 1934ce9d6f07..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-4.html
+++ /dev/null
@@ -1,22 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<link rel="stylesheet" type="text/css" href="support/ahem.css">
-<link rel="match" href="segment-break-transformation-unremovable-ref.html">
-<meta name="assert" content="Test checks that a sequence which consists of multiple collapsible
-segment breaks mixed with multiple white spaces should be converted to a white space (U+0020),
-if both the character before/after the sequence is Hangul.">
-<style> p { font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>one</b> white space between 2nd and 3rd CJK character.
-<!--Some[WS][LF][WS][LF][WS][LF][WS]Hangul-->
-<p>&#x4e00;&#x4e9b;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#x000a;&#x0020;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-ref.html b/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-ref.html
deleted file mode 100644
index 589da00bbb4a..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/segment-break-transformation-unremovable-ref.html
+++ /dev/null
@@ -1,17 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Text 4.1.2. Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p { font-family: ahem; } </style>
-</head>
-<body>
-<div>Test passes if there is <b>one</b> white space between 2nd and 3rd CJK character.
-<!--Some Hangul-->
-<p>&#x4e00;&#x4e9b;&nbsp;&#xc5b8;&#xbb38;</p>
-</div>
-</body>
-</html>
diff --git a/layout/reftests/w3c-css/submitted/text3/support/generate-segment-break-transformation-rules-tests.py b/layout/reftests/w3c-css/submitted/text3/support/generate-segment-break-transformation-rules-tests.py
deleted file mode 100644
index c45db7c99f93..000000000000
--- a/layout/reftests/w3c-css/submitted/text3/support/generate-segment-break-transformation-rules-tests.py
+++ /dev/null
@@ -1,109 +0,0 @@
-#!/usr/bin/env python
-# - * - coding: UTF-8 - * -
-
-"""
-This script generates tests segment-break-transformation-rules-001 ~ 049 which
-cover all possible combinations of characters at two sides of segment breaks.
-More specifically, there are seven types of characters involve in these rules:
-
-1. East Asian Full-width (F)
-2. East Asian Half-width (H)
-3. East Asian Wide (W) except Hangul
-4. East Asian Narrow (Na)
-5. East Asian Ambiguous (A)
-6. Not East Asian (Neutral)
-7. Hangul
-
-So there are 49 different combinations. It outputs a list of all
-tests it generated in the format of Mozilla reftest.list to the stdout.
-"""
-
-from __future__ import unicode_literals
-
-TEST_FILE = 'segment-break-transformation-rules-{:03}.html'
-TEST_TEMPLATE = '''<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Test: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="help" href="https://drafts.csswg.org/css-text/#line-break-transform">
-<meta name="assert" content="'segment-break-transformation-rules: with {prev}/{next} in front/back of the semgment break.">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<link rel="match" href="segment-break-transformation-rules-{index:03}-ref.html">
-<style> p {{ font-family: ahem; }} </style>
-<div>Pass if there is {expect} white space between the two strings below.
-<p>{prevchar}&#x000a;{nextchar}</p>
-</div>
-'''
-
-REF_FILE = 'segment-break-transformation-rules-{:03}-ref.html'
-REF_TEMPLATE_REMOVE = '''<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p {{ font-family: ahem; }} </style>
-<div>Pass if there is NO white space between the two strings below.
-<p>{0}{1}</p>
-</div>
-'''
-REF_TEMPLATE_KEEP = '''<!DOCTYPE html>
-<meta charset="utf-8">
-<title>CSS Reftest Reference: Segment Break Transformation Rules</title>
-<link rel="author" title="Chun-Min (Jeremy) Chen" href="mailto:jeremychen@mozilla.com">
-<link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<link rel="stylesheet" type="text/css" href="support/ahem.css" />
-<style> p {{ font-family: ahem; }} </style>
-<div>Pass if there is ONE white space between the two strings below.
-<p>{0}{2}{1}</p>
-</div>
-'''
-
-CHAR_SET = [
-        ('East Asian Full-width (F)',         'ＦＵＬＬＷＩＤＴＨ'),
-        ('East Asian Half-width (H)',         'ﾃｽﾄ'),
-        ('East Asian Wide (W) except Hangul', '測試'),
-        ('East Asian Narrow (Na)',            'narrow'),
-        ('East Asian Ambiguous (A)',          '■'),
-        ('Not East Asian (Neutral)',          'آزمون'),
-        ('Hangul',                            '테스트'),
-        ]
-
-def write_file(filename, content):
-    with open(filename, 'wb') as f:
-        f.write(content.encode('UTF-8'))
-
-print("# START tests from {}".format(__file__))
-global idx
-idx = 0
-for i, (prevtype, prevchars) in enumerate(CHAR_SET):
-    for j, (nextype, nextchars) in enumerate(CHAR_SET):
-        idx += 1
-        reffilename = REF_FILE.format(idx)
-        testfilename = TEST_FILE.format(idx)
-        # According to CSS Text 3 - 4.1.2. Segment Break Transformation Rules,
-        # if the East Asian Width property of both the character before and
-        # after the segment break is F, W, or H (not A), and neither side is
-        # Hangul, then the segment break is removed. Otherwise, the segment
-        # break is converted to a space (U+0020).
-        if i < 3 and j < 3:
-            write_file(reffilename,
-                       REF_TEMPLATE_REMOVE.format(prevchars, nextchars))
-            write_file(testfilename,
-                       TEST_TEMPLATE.format(index=idx, prev=prevtype,
-                                            next=nextype,
-                                            prevchar=prevchars,
-                                            nextchar=nextchars,
-                                            expect='NO'))
-        else:
-            write_file(reffilename,
-                       REF_TEMPLATE_KEEP.format(prevchars, nextchars, '&#x0020;'))
-            write_file(testfilename,
-                       TEST_TEMPLATE.format(index=idx, prev=prevtype,
-                                            next=nextype,
-                                            prevchar=prevchars,
-                                            nextchar=nextchars,
-                                            expect='ONE'))
-        print("== {} {}".format(testfilename, reffilename))
-print("# END tests from {}".format(__file__))