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+<!DOCTYPE html>
+<html lang="en" class="reftest-wait">
+<meta charset="utf-8">
+<title>This test fails - Opacity containers should anticipate animations of the contents when deciding whether to pull a background color</title>
+
+<style>
+
+div {
+ min-height: 50px;
+ box-model: border-box;
+}
+
+.first, .second {
+ border: 1px solid blue;
+ margin: 50px 0;
+ position: relative;
+}
+
+.border {
+ border: 1px solid black;
+}
+
+.underlap {
+ border: 1px solid #088;
+ margin-left: 120px;
+ width: 80px;
+ margin-bottom: -30px;
+}
+
+.opacity {
+ opacity: 0.9;
+ height: auto;
+ padding: 10px 0 20px;
+}
+
+.animated-position {
+ position: relative;
+ left: 20px;
+ margin-left: 220px;
+ width: 100px;
+ height: 100px;
+ border-color: red;
+}
+
+body {
+ margin: 0;
+ padding: 0 100px;
+ height: 3000px;
+}
+
+</style>
+
+<div class="first" reftest-assigned-layer="page-background">
+ <!--
+ This is just a regular box, it should end up in the page background layer.
+ -->
+</div>
+
+<div class="underlap">
+ <!--
+ This item intersects with the scrollable box and is positioned below
+ .scrollable, in z-order.
+ -->
+</div>
+
+<div class="border">
+ <div class="opacity">
+ <div class="border animated-position reftest-no-paint">
+ <!--
+ This item start out above solid white background but will move to
+ intersect .underlap, so it shouldn't pull up the background color.
+ However, the opacity item that wraps this item only looks at the
+ current bounds of its contents, so this test will fail.
+ -->
+ </div>
+ </div>
+</div>
+
+<div class="second" reftest-assigned-layer="page-background">
+ <!--
+ This should share a layer with .first and the page background.
+ -->
+</div>
+
+<script>
+
+var animatedLeft = document.querySelector(".animated-position");
+
+function doTest() {
+ animatedLeft.style.left = "-40px";
+ document.documentElement.removeAttribute("class");
+}
+
+// Layerize #animatedLeft
+animatedLeft.offsetLeft;
+animatedLeft.style.left = "40px";
+animatedLeft.offsetLeft;
+animatedLeft.style.left = "60px";
+animatedLeft.offsetLeft;
+
+document.addEventListener("MozReftestInvalidate", doTest, false);
+setTimeout(doTest, 200);
+
+</script>
+