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Test Info:
<html><head>↩
<style>↩
div {↩
outline: 1px solid black;↩
}↩
</style>↩
↩
</head><body>↩
You should see no red, only green<br>↩
<div style="overflow: scroll; height: 200px; z-index: 2; position: relative; background-color: red;"></div>↩
<div class="displayport" reftest-displayport-h="500" style="overflow: scroll; position: relative; margin-top: -200px; height: 200px;">↩
<div style="z-index: 10; position: absolute; width: 100%; height: 500px; bottom: -300px;">↩
<div style="height: 200px; background-color: lime;"></div>↩
</div>↩
</div>↩
</body></html>↩