Backed out changeset cf2c8ac2f33c (bug 1853255) for causing failures in Browser_zero_area.js CLOSED TREE

accessible/tests/browser/bounds/browser_position.js

accessible/generic/LocalAccessible.cpp

@@ -622,27 +622,18 @@ nsRect LocalAccessible::ParentRelativeBounds() {
       result.MoveBy(frame->GetOffsetTo(boundingFrame));
     }
 
-    if (nsLayoutUtils::GetNextContinuationOrIBSplitSibling(boundingFrame)) {
-      // Constructing a bounding box across a frame that has an IB split means
-      // the origin is likely be different from that of boundingFrame.
-      // Descendants will need their parent-relative bounds adjusted
-      // accordingly, since parent-relative bounds are constructed to the
-      // bounding box of the entire element and not each individual IB split
-      // frame. In the case that boundingFrame's rect is empty,
-      // GetAllInFlowRectsUnion might exclude its origin. For example, if
-      // boundingFrame is empty with an origin of (0, -840) but has a non-empty
-      // ib-split-sibling with (0, 0), the union rect will originate at (0, 0).
-      // This means the bounds returned for our parent Accessible might be
-      // offset from boundingFrame's rect. Since result is currently relative to
-      // boundingFrame's rect, we might need to adjust it to make it parent
-      // relative.
+    if (boundingFrame->GetRect().IsEmpty()) {
+      // boundingFrame might be the first in an ib-split-sibling chain. If its
+      // rect is empty, GetAllInFlowRectsUnion might exclude its origin. For
+      // example, if boundingFrame is empty with an origin of (0, -840) but
+      // has a non-empty ib-split-sibling with (0, 0), the union rect will
+      // originate at (0, 0). This means the bounds returned for our parent
+      // Accessible might be offset from boundingFrame's rect. Since result is
+      // currently relative to boundingFrame's rect, we might need to adjust it
+      // to make it parent relative.
       nsRect boundingUnion =
           nsLayoutUtils::GetAllInFlowRectsUnion(boundingFrame, boundingFrame);
       if (!boundingUnion.IsEmpty()) {
-        // The origin of boundingUnion is relative to boundingFrame, meaning
-        // when we call MoveBy on result with this value we're offsetting
-        // `result` by the distance boundingFrame's origin was moved to
-        // construct its bounding box.
         result.MoveBy(-boundingUnion.TopLeft());
       } else {
         // Since GetAllInFlowRectsUnion returned an empty rect on our parent

accessible/tests/browser/bounds/browser_position.js

@@ -101,35 +101,3 @@ addAccessibleTask(
   },
   { chrome: true, topLevel: true, remoteIframe: true }
 );
-
-/**
- * Test the bounds of items in an inline list with content that offsets the
- * origin of the list's bounding box (creating an IB split within the UL frame).
- */
-addAccessibleTask(
-  `
-  <style>
-    ul,li {
-      display:inline;
-      list-style-type:none;
-      list-style-position:inside;
-      margin:0;
-      padding:0;
-    }
-    </style>
-    <div id="container" style="background:green; max-width: 400px;">List of information: <ul id="list"><li id="one">item one</li> | <li id="two">item two</li> | <li id="three">item three</li> | <li id="four">item four</li> | <li id="five">item five</li></ul></div>
-  `,
-  async function (browser, docAcc) {
-    await testBoundsWithContent(docAcc, "list", browser);
-    await testBoundsWithContent(docAcc, "one", browser);
-    await testBoundsWithContent(docAcc, "two", browser);
-    await testBoundsWithContent(docAcc, "three", browser);
-    await testBoundsWithContent(docAcc, "four", browser);
-    await testBoundsWithContent(docAcc, "five", browser);
-  },
-  {
-    chrome: true,
-    topLevel: true,
-    iframe: true,
-  }
-);