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<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title></title>
<style>
#mask {
clip-path: circle(50%);
width: 100px;
height: 100px;
opacity: 0.9;
}
#content {
width: 100px;
height: 100px;
background-color: green;
}
</style>
</head>
<body>
<div id="mask">
<div id="content"></div>
</div>
<script type="text/javascript">
function step1() {
document.querySelector("#mask").style.opacity = 0.1;
window.requestAnimationFrame(() => window.requestAnimationFrame(step2));
};
function step2() {
document.querySelector("#mask").style.opacity = 0.5;
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", step1);
</script>
</body>
</html>
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