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<!DOCTYPE HTML>
<style>
.scroller {
width: 100px;
height: 100px;
border: 1px solid black;
overflow: scroll;
}
.scrolled {
width: 40px;
height: 40px;
background: green;
}
.neg-zorder {
position: relative;
z-index: -1;
transform: translateZ(0);
background: blue;
}
</style>
<script>
if (window.internals) {
internals.settings.setPreferCompositingToLCDTextEnabled(true);
}
</script>
<div class="scroller">
<div class="scrolled neg-zorder" id="to-modify"></div>
<div class="scrolled"></div>
<div class="scrolled"></div>
<div class="scrolled"></div>
</div>
<script>
if (window.testRunner)
testRunner.dumpAsText();
if (window.internals) {
window.internals.forceCompositingUpdate(document);
window.internals.startTrackingRepaints(document);
}
document.querySelector('style').appendChild(document.createTextNode('#to-modify { display: none }'));
if (window.internals) {
var layerTree = document.createElement('pre');
layerTree.innerHTML = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_PAINTING_PHASES);
window.internals.stopTrackingRepaints(document);
document.body.appendChild(layerTree);
}
</script>
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