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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
<title>Bug 1472465</title>
<style type="text/css">
#container {
border: 1px solid;
width: 500px;
height: 500px;
overflow: hidden;
}
#box {
opacity: 0.1;
position: absolute;
top: 100px
left: 100px;
z-index:1;
background-color: green;
width: 100px;
height: 100px;
}
#bg {
position:relative;
width: 2500px;
height: 2500px;
left: 300px;
top: 300px;
}
</style>
<script type="text/javascript">
function changeOpacity() {
var box = document.querySelector("#box");
box.style.opacity = "1.0";
document.documentElement.removeAttribute("class");
}
function moveBg() {
var bg = document.querySelector("#bg");
bg.style.top = "0px";
bg.style.left = "0px";
setTimeout(changeOpacity, 200);
}
function doTest() {
moveBg();
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>
</head>
<body>
<div id="container">
<div id="bg">
<div id="box">
Text to force layer state to inactive, that will get flattened.
</div>
</div>
</div>
</body>
</html>