author Xianzhu Wang <>
Tue, 05 Mar 2019 12:18:01 +0000
changeset 464575 4325ba7b38576495a78289c2a8f4dff391922e66
parent 329664 7b434711753b98a87603453caaa0945791ffe12b
permissions -rw-r--r--
Bug 1529059 [wpt PR 15420] - [BlinkGenPropertyTrees] Initiailize double_sided of synthetic effect, a=testonly Automatic update from web-platform-tests [BlinkGenPropertyTrees] Initiailize double_sided of synthetic effect Previously synthetic effects always had double_sided==false, causing the layer disappear when the backface was facing forward. Bug: 928190 Change-Id: I35534b40346d5c5918bc99c00a4ca6b4e3b68796 Reviewed-on: Reviewed-by: Philip Rogers <> Commit-Queue: Xianzhu Wang <> Cr-Commit-Position: refs/heads/master@{#632764} -- wpt-commits: a89467050deaf1dcbd9140a2f0670b1b85e518ee wpt-pr: 15420

<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Scrollboxes with non-uniform backgrounds should prevent their contents from pulling background colors, even if those contents start out above uniform backgrounds</title>
  This is the same test as pull-background-3.html, but with an additional
  wrapping opacity container layer.


div {
  min-height: 50px;
  box-model: border-box;

.first, .second {
  border: 1px solid blue;
  margin: 50px 0;

.border {
  border: 1px solid black;

.underlap {
  border: 1px solid #088;
  margin-left: 120px;
  width: 80px;
  margin-bottom: -30px;

.scrollable {
  height: auto;
  overflow: auto;

.scrollarea {
  width: 5000px;
  border: none;
  padding: 10px 0 20px;
  height: auto;

.scrolled {
  margin-left: 220px;
  width: 100px;
  height: 100px;
  border-color: red;

body {
  margin: 0;
  padding: 0 100px;
  height: 3000px;


<div class="first" reftest-assigned-layer="page-background">
    This is just a regular box, it should end up in the page background layer.

<div class="underlap">
    This item intersects with the scrollable box and is positioned below
    .scrollable, in z-order.

<div class="opacity border">
  <div class="opacity scrollable">
    <div class="scrollarea">
      <div class="scrolled border reftest-no-paint">
          This box starts out above solid white background, but it will move so
          that it intersects .underlap, so it shouldn't pull up a background
          color to begin with so that it doesn't need to invalidate.

<div class="second" reftest-assigned-layer="page-background">
    This should share a layer with .first and the page background.


var scrollable = document.querySelector(".scrollable");

function doTest() {
  scrollable.scrollLeft = 100;

// Make .scrollable start out with active scrolling.
scrollable.scrollLeft = 0;
scrollable.scrollLeft = 10;
document.addEventListener("MozReftestInvalidate", doTest);