<!DOCTYPE html>
<html>
<head>
<style type="text/css" media="screen">
.hidden {
visibility: hidden;
}
.visible {
visibility: visible;
}
.box {
width: 300px;
height: 300px;
}
.composited {
transform: translatez(0);
}
.topLeft {
position: absolute;
top: 0px;
left: 0px;
}
.stackingContext {
position: absolute;
z-index: 5;
}
.red {
background-color: red;
}
.green {
background-color: green;
}
</style>
</head>
<body>
<!--
https://bugs.webkit.org/show_bug.cgi?id=108118
(Note: CompositedLayerMapping was formerly known as LayerBacking)
The boolean check CompositedLayerMapping::hasVisibleNonCompositingDescendant()
was actually not checking for visible content beyond children layers. As a
result, composited layers sometimes did not see that they actually have
visible content in a descendant Layer. This test recreates that
scenario by using visibility:hidden stacking contexts to create a deeper
hierarchy of Layers within on composited layer.
The green box should be visible, hiding the red box.
-->
<div>
<div class="topLeft red box">
</div>
<div class="composited topLeft hidden box">
<div class="hidden stackingContext">
<div class="hidden stackingContext">
<div class="visible green box">
</div>
</div>
</div>
</div>
</div>
</body>
</html>