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chromium/third_party/blink/web_tests/http/tests/devtools/resources/layer-navigation-target.html 

<html>
<head>
<script src="../inspector-test.js"></script>
<script>
function test()
{
}
</script>
<style>
.layer {
    transform: translateZ(10px);
    opacity: 0.8;
}
</style>
</head>
<body onload="runTest()">
<div id="n1" class="layer"></div>
<div id="n2" class="layer">
    <div id="n21" class="layer"></div>
    <div id="n22" class="layer"></div>
</div>
</body>
</html>