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<!DOCTYPE html>
<style>
#stacking {
position: absolute;
width: 200px;
height: 200px;
background-color: lightgreen;
}
#clipper {
width: 100px;
height: 100px;
background-color: lightblue;
z-index: -1;
}
.clipping {
overflow: hidden;
}
#composited {
position: relative;
top: 50px;
width: 100px;
height: 100px;
transform: translateZ(0);
background-color: salmon;
}
#squashed {
position: relative;
top: -50px;
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div id="stacking">
<div id="clipper">
<div id="composited"></div>
<div id="squashed"></div>
</div>
<div>
<pre></pre>
<script>
if (window.testRunner) {
testRunner.dumpAsText();
} else {
alert('This test require window.testRunner.')
}
window.internals.forceCompositingUpdate(document);
document.querySelector('#clipper').className = 'clipping';
window.internals.forceCompositingUpdate(document);
document.querySelector('#clipper').className = '';
window.internals.forceCompositingUpdate(document);
document.querySelector('#clipper').className = 'clipping';
document.querySelector('pre').textContent = internals.layerTreeAsText(document);
</script>
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