diff --git a/gfx/thebes/gfxTextRun.cpp b/gfx/thebes/gfxTextRun.cpp
index 691014e93399..e199f8f34a33 100644
--- a/gfx/thebes/gfxTextRun.cpp
+++ b/gfx/thebes/gfxTextRun.cpp
@@ -2573,10 +2573,13 @@ gfxFontGroup::InitScriptRun(gfxContext *aContext,
 }
 
 gfxTextRun *
-gfxFontGroup::GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel,
+gfxFontGroup::GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel, uint32_t aFlags,
                                  LazyReferenceContextGetter& aRefContextGetter)
 {
+    MOZ_ASSERT(!(aFlags & ~TEXT_ORIENT_MASK),
+               "flags here should only be used to specify orientation");
     if (mCachedEllipsisTextRun &&
+        (mCachedEllipsisTextRun->GetFlags() & TEXT_ORIENT_MASK) == aFlags &&
         mCachedEllipsisTextRun->GetAppUnitsPerDevUnit() == aAppUnitsPerDevPixel) {
         return mCachedEllipsisTextRun;
     }
@@ -2596,7 +2599,7 @@ gfxFontGroup::GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel,
     };
     gfxTextRun* textRun =
         MakeTextRun(ellipsis.get(), ellipsis.Length(), &params,
-                    TEXT_IS_PERSISTENT, nullptr);
+                    aFlags | TEXT_IS_PERSISTENT, nullptr);
     if (!textRun) {
         return nullptr;
     }
diff --git a/gfx/thebes/gfxTextRun.h b/gfx/thebes/gfxTextRun.h
index afc0e1e7938e..a5cf38f4c459 100644
--- a/gfx/thebes/gfxTextRun.h
+++ b/gfx/thebes/gfxTextRun.h
@@ -878,10 +878,10 @@ public:
     };
     // The gfxFontGroup keeps ownership of this textrun.
     // It is only guaranteed to exist until the next call to GetEllipsisTextRun
-    // (which might use a different appUnitsPerDev value) for the font group,
-    // or until UpdateUserFonts is called, or the fontgroup is destroyed.
+    // (which might use a different appUnitsPerDev value or flags) for the font
+    // group, or until UpdateUserFonts is called, or the fontgroup is destroyed.
     // Get it/use it/forget it :) - don't keep a reference that might go stale.
-    gfxTextRun* GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel,
+    gfxTextRun* GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel, uint32_t aFlags,
                                    LazyReferenceContextGetter& aRefContextGetter);
 
     // helper method for resolving generic font families
@@ -1042,7 +1042,7 @@ protected:
     gfxTextPerfMetrics *mTextPerf;
 
     // Cache a textrun representing an ellipsis (useful for CSS text-overflow)
-    // at a specific appUnitsPerDevPixel size
+    // at a specific appUnitsPerDevPixel size and orientation
     nsAutoPtr<gfxTextRun>   mCachedEllipsisTextRun;
 
     // cache the most recent pref font to avoid general pref font lookup
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 5a63d09e29ce..2e293e3775a3 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -6472,42 +6472,42 @@ nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
   default:
     break;
   }
+  return result | GetTextRunOrientFlagsForStyle(aStyleContext);
+}
+
+/* static */ uint32_t
+nsLayoutUtils::GetTextRunOrientFlagsForStyle(nsStyleContext* aStyleContext)
+{
   WritingMode wm(aStyleContext);
   if (wm.IsVertical()) {
     switch (aStyleContext->StyleVisibility()->mTextOrientation) {
     case NS_STYLE_TEXT_ORIENTATION_MIXED:
-      result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_MIXED;
-      break;
+      return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_MIXED;
     case NS_STYLE_TEXT_ORIENTATION_UPRIGHT:
-      result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
-      break;
+      return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
     case NS_STYLE_TEXT_ORIENTATION_SIDEWAYS:
       // This should depend on writing mode vertical-lr vs vertical-rl,
       // but until we support SIDEWAYS_LEFT, we'll treat this the same
       // as SIDEWAYS_RIGHT and simply fall through.
       /*
       if (wm.IsVerticalLR()) {
-        result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
+        return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
       } else {
-        result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
+        return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
       }
-      break;
       */
     case NS_STYLE_TEXT_ORIENTATION_SIDEWAYS_RIGHT:
-      result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
-      break;
+      return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
     case NS_STYLE_TEXT_ORIENTATION_SIDEWAYS_LEFT:
       // Not yet supported, so fall through to the default (error) case.
       /*
-      result |= gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
-      break;
+      return gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
       */
     default:
       NS_NOTREACHED("unknown text-orientation");
-      break;
     }
   }
-  return result;
+  return 0;
 }
 
 /* static */ void
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index 2653455c048a..8a5df1164698 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -1923,6 +1923,11 @@ public:
                                           const nsStyleText* aStyleText,
                                           nscoord aLetterSpacing);
 
+  /**
+   * Get orientation flags for textrun construction.
+   */
+  static uint32_t GetTextRunOrientFlagsForStyle(nsStyleContext* aStyleContext);
+
   /**
    * Takes two rectangles whose origins must be the same, and computes
    * the difference between their union and their intersection as two
diff --git a/layout/generic/TextOverflow.cpp b/layout/generic/TextOverflow.cpp
index 39f814c4a425..a71719c7dbdd 100644
--- a/layout/generic/TextOverflow.cpp
+++ b/layout/generic/TextOverflow.cpp
@@ -49,7 +49,9 @@ GetEllipsisTextRun(nsIFrame* aFrame)
     nsLayoutUtils::FontSizeInflationFor(aFrame));
   LazyReferenceRenderingContextGetterFromFrame lazyRefContextGetter(aFrame);
   return fm->GetThebesFontGroup()->GetEllipsisTextRun(
-      aFrame->PresContext()->AppUnitsPerDevPixel(), lazyRefContextGetter);
+    aFrame->PresContext()->AppUnitsPerDevPixel(),
+    nsLayoutUtils::GetTextRunOrientFlagsForStyle(aFrame->StyleContext()),
+    lazyRefContextGetter);
 }
 
 static nsIFrame*