Float layer should ignore offsets from ancestor inline layers under containing block

third_party/WebKit/Source/core/paint/PaintLayerTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintLayer.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
@@ skipping 507 matching lines @@
           ->layer();
 
   // enclosingLayerWithCompositedLayerMapping is not needed or applicable to
   // SPv2.
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     EXPECT_EQ(compositedContainer,
               target->enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
   }
 }
 
+TEST_P(PaintLayerTest, FloatLayerAndAbsoluteUnderInlineLayer) {
+  setBodyInnerHTML(
+      "<div id='container' style='position: absolute; top: 20px; left: 20px'>"
+      "  <div style='margin: 33px'>"
+      "    <span id='span' style='position: relative; top: 100px; left: 100px'>"
+      "      <div id='floating'"
+      "        style='float: left; position: relative; top: 50px; left: 50px'>"
+      "      </div>"
+      "      <div id='absolute'"
+      "        style='position: absolute; top: 50px; left: 50px'>"
+      "      </div>"
+      "    </span>"
+      "  </div>"
+      "</div>");
+
+  PaintLayer* floating =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("floating"))->layer();
+  PaintLayer* absolute =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("absolute"))->layer();
+  PaintLayer* span =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("span"))->layer();
+  PaintLayer* container =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("container"))->layer();
+
+  EXPECT_EQ(span, floating->parent());
+  EXPECT_EQ(span, absolute->parent());
+  EXPECT_EQ(container, span->parent());
+
+  EXPECT_EQ(LayoutPoint(83, 83), floating->location());
+  EXPECT_EQ(LayoutPoint(50, 50), absolute->location());
+  EXPECT_EQ(LayoutPoint(133, 133), span->location());
+  EXPECT_EQ(LayoutPoint(20, 20), container->location());
+
+  EXPECT_EQ(LayoutPoint(-50, -50), floating->visualOffsetFromAncestor(span));
+  EXPECT_EQ(LayoutPoint(50, 50), absolute->visualOffsetFromAncestor(span));
+  EXPECT_EQ(LayoutPoint(83, 83), floating->visualOffsetFromAncestor(container));
+  EXPECT_EQ(LayoutPoint(183, 183),
+            absolute->visualOffsetFromAncestor(container));
+}
+
+TEST_P(PaintLayerTest, FloatLayerUnderBlockUnderInlineLayer) {
+  setBodyInnerHTML(
+      "<style>body {margin: 0}</style>"
+      "<span id='span' style='position: relative; top: 100px; left: 100px'>"
+      "  <div style='display: inline-block; margin: 33px'>"
+      "    <div id='floating'"
+      "        style='float: left; position: relative; top: 50px; left: 50px'>"
+      "    </div>"
+      "  </div>"
+      "</span>");
+
+  PaintLayer* floating =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("floating"))->layer();
+  PaintLayer* span =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("span"))->layer();
+
+  EXPECT_EQ(span, floating->parent());
+
+  EXPECT_EQ(LayoutPoint(83, 83), floating->location());
+  EXPECT_EQ(LayoutPoint(100, 100), span->location());
+  EXPECT_EQ(LayoutPoint(83, 83), floating->visualOffsetFromAncestor(span));
+  EXPECT_EQ(LayoutPoint(183, 183), floating->visualOffsetFromAncestor(
+                                       document().layoutView()->layer()));
+}
+
 TEST_P(PaintLayerTest, CompositingContainerFloatingIframe) {
   enableCompositing();
   setBodyInnerHTML(
       "<div id='compositedContainer' style='position: relative;"
       "    will-change: transform'>"
       "  <div id='containingBlock' style='position: relative; z-index: 0'>"
       "    <div style='backface-visibility: hidden'></div>"
       "    <span id='span'"
       "        style='clip-path: polygon(0px 15px, 0px 54px, 100px 0px)'>"
       "      <iframe srcdoc='foo' id='target' style='float: right'></iframe>"
@@ skipping 17 matching lines @@
 
   // enclosingLayerWithCompositedLayerMapping is not needed or applicable to
   // SPv2.
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     EXPECT_EQ(compositedContainer,
               target->enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
   }
 }
 
 }  // namespace blink