Hittest for RootInlineBox/InlineFlowBox should take care of border-radius.

Source/core/layout/line/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 957 matching lines @@
 }
 
 bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
     flipForWritingMode(overflowRect);
     overflowRect.moveBy(accumulatedOffset);
     if (!locationInContainer.intersects(overflowRect))
         return false;
 
+    if (layoutObject().style()->hasBorderRadius()) {
+        LayoutRect borderRect = logicalFrameRect();
+        borderRect.moveBy(accumulatedOffset);
+        FloatRoundedRect border = layoutObject().style()->getRoundedBorderFor(borderRect, includeLogicalLeftEdge(), includeLogicalRightEdge());
+        if (!locationInContainer.intersects(border)) {
+            // For child whose bounding box is flowing ouside it's parent border.
+            bool hasChildAtPoint = false;
+            for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {

[davve, 2015/03/27 12:40:20]

Instead of having a loop here and a preliminary hit-test, could we instead move
this entire check to somewhere around the "Now check ourselves." part of the
function? The idea being that we have already ruled out hitting children by
then.

[Abhijeet Kandalkar Slow, 2015/03/27 13:08:26]

Done.

+                LayoutRect absoluteRect = curr->logicalFrameRect();
+                absoluteRect.moveBy(accumulatedOffset);
+                if (locationInContainer.intersects(absoluteRect)) {
+                    hasChildAtPoint = true;
+                    break;
+                }
+            }
+
+            if (!hasChildAtPoint)
+                return false;
+        }
+    }
+
     // Check children first.
     // We need to account for culled inline parents of the hit-tested nodes, so that they may also get included in area-based hit-tests.
     LayoutObject* culledParent = 0;
     for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {
         if (curr->layoutObject().isText() || !curr->boxModelObject()->hasSelfPaintingLayer()) {
             LayoutObject* newParent = 0;
             // Culled parents are only relevant for area-based hit-tests, so ignore it in point-based ones.
             if (locationInContainer.isRectBasedTest()) {
                 newParent = curr->layoutObject().parent();
                 if (newParent == layoutObject())
@@ skipping 311 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink