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

Source/core/layout/line/InlineFlowBox.cpp

Index: Source/core/layout/line/InlineFlowBox.cpp
diff --git a/Source/core/layout/line/InlineFlowBox.cpp b/Source/core/layout/line/InlineFlowBox.cpp
index 1a072b6271391cb9f8b693cfadb928454ad1a5bf..de1d1aaa21c1fd29b1b6fdaca9258b16e03bb40c 100644
--- a/Source/core/layout/line/InlineFlowBox.cpp
+++ b/Source/core/layout/line/InlineFlowBox.cpp
@@ -1012,6 +1012,14 @@ bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& re
         culledParent = culledParent->parent();
     }
 
+    if (layoutObject().style()->hasBorderRadius()) {
+        LayoutRect borderRect = logicalFrameRect();
+        borderRect.moveBy(accumulatedOffset);
+        FloatRoundedRect border = layoutObject().style()->getRoundedBorderFor(borderRect, includeLogicalLeftEdge(), includeLogicalRightEdge());
+        if (!locationInContainer.intersects(border))
+            return false;
+    }
+
     // Now check ourselves. Pixel snap hit testing.
     LayoutRect frameRect(roundedFrameRect());
     LayoutUnit minX = frameRect.x();