ScrollRectToVisible should bubble up through its layout container.

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 557 matching lines @@
     LayoutRect rectToScroll = rect;
     if (rectToScroll.width() <= 0)
         rectToScroll.setWidth(LayoutUnit(1));
     if (rectToScroll.height() <= 0)
         rectToScroll.setHeight(LayoutUnit(1));
 
     LayoutBox* parentBox = nullptr;
     LayoutRect newRect = rectToScroll;
 
     bool restrictedByLineClamp = false;
-    if (parent()) {
-        parentBox = parent()->enclosingBox();
-        restrictedByLineClamp = !parent()->style()->lineClamp().isNone();
+    if (container()) {
+        parentBox = container()->enclosingBox();

[bokan, 2016/09/15 20:54:41]

I think we could use containingBlock rather than container here and then you
wouldn't need enclosingBox (since block is a box).

+        restrictedByLineClamp = !container()->style()->lineClamp().isNone();
     }
 
     if (hasOverflowClip() && !restrictedByLineClamp) {
         // Don't scroll to reveal an overflow layer that is restricted by the -webkit-line-clamp property.
         // This will prevent us from revealing text hidden by the slider in Safari RSS.
         newRect = getScrollableArea()->scrollIntoView(rectToScroll, alignX, alignY, scrollType);
         if (newRect.isEmpty())
             return;
     } else if (!parentBox && canBeProgramaticallyScrolled()) {
         if (FrameView* frameView = this->frameView()) {
@@ skipping 4265 matching lines @@
         m_rareData->m_snapAreas->remove(&snapArea);
     }
 }
 
 SnapAreaSet* LayoutBox::snapAreas() const
 {
     return m_rareData ? m_rareData->m_snapAreas.get() : nullptr;
 }
 
 } // namespace blink