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<!DOCTYPE html>
<style>
#parent {
overflow:hidden;
width: 400px;
height: 400px;
background-color: pink;
transform: translateZ(0)
}
#child {
opacity: 0.9;
width: 200px;
height: 200px;
background-color: salmon;
transition: opacity 5ms;
}
.fade #child {
visibility: hidden;
opacity: 0.2;
}
</style>
<div id="parent">
<div id="child"></div>
</div>
<pre></pre>
<script>
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
}
requestAnimationFrame(function() {
requestAnimationFrame(function() {
document.getElementById('parent').classList.add('fade');
document.getElementById('child').addEventListener('transitionend', function() {
if (window.testRunner) {
document.getElementsByTagName('pre')[0].textContent = window.internals.layerTreeAsText(document);
setTimeout(function() {
testRunner.notifyDone();
});
}
});
});
});
</script>
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