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<!DOCTYPE HTML>
<style>
#scroller {
width: 200px;
height: 200px;
border: 1px solid black;
overflow: scroll;
}
.scrolled {
width: 100px;
height: 100px;
background: papayawhip;
border: 1px solid black;
margin: 10px;
position: relative;
}
#fixed {
width: 80px;
height: 80px;
background: blue;
will-change: transform;
position: fixed;
top: 0px;
left: 0px;
}
#composited {
width: 20px;
height: 20px;
background: green;
position: relative;
will-change: transform;
}
#unsquashed {
z-index: 1;
}
</style>
<div id="scroller">
<div id="fixed"></div>
<div class="scrolled"></div>
<div class="scrolled"></div>
<div id="unsquashed" class="scrolled">
<div id="composited"></div>
</div>
</div>
<script src='../../resources/js-test.js'></script>
<script>
description('Verifies that scroll children with composited descendants' +
' do not squash.');
if (window.internals)
internals.settings.setPreferCompositingToLCDTextEnabled(true);
function scrollChildDoesNotSquash(layer) {
if (layer.children) {
for (var i = 0; i < layer.children.length; i++) {
var child = layer.children[i];
if (child.bounds && layer.bounds &&
child.bounds[0] == 20 && child.bounds[1] == 20 &&
layer.bounds[0] == 102 && layer.bounds[1] == 102) {
// If the child's bounds are 20x20, we're the scroll child with the
// composited descendant. We should not have squashed and therefore our
// bounds should remain 102x102 (100x100 plus the 1px border).
return true;
}
if (scrollChildDoesNotSquash(child))
return true;
}
}
return false;
}
onload = function() {
if (!window.internals)
return;
documentLayerTree = JSON.parse(window.internals.layerTreeAsText(document));
shouldBe('scrollChildDoesNotSquash(documentLayerTree)', 'true');
};
</script>
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