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<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
}
.testcase {
position: absolute;
}
.testcase div {
background-color: green;
}
</style>
</head>
<body>
This test passes if no red is showing.
<div style="position: relative; background-color: transparent;">
<div class="testcase" style="top:0; left: 0">
<div style="width: 100px; height: 50px"></div>
<div style="width: 100px; overflow-x: scroll"></div>
<div style="width: 100px; height: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="height: 50px; writing-mode: vertical-lr; top: 0; left: 150px">
<div style="width: 100px"></div>
<div style="overflow-y: scroll"></div>
<div style="width: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="height: 50px; writing-mode: vertical-lr; top: 0; left: 300px">
<div style="width: 100px"></div>
<div style="overflow-y: scroll"></div>
<div style="width: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="top: 0; left: 450px">
<div style="width: 100px; height: 50px"></div>
<div style="width: 100px; overflow-x: scroll"></div>
<div style="width: 100px; height: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="top: 100px; left: 0">
<div style="width: 100px; height: 50px; "></div>
<div style="width: 100px; overflow-x: scroll"></div>
<div style="width: 100px; height: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="height: 50px; writing-mode: vertical-lr; top: 100px; left: 150px">
<div style="width: 90px; overflow-y: scroll"></div>
<div style="width: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="top: 100px; left: 300px">
<div style="width: 100px; height: 40px; overflow-x: scroll"></div>
<div style="width: 100px; height: 10px; position: relative; z-index: -1"></div>
</div>
<div class="testcase" style="height: 50px; writing-mode: vertical-lr; top: 100px; left: 450px">
<div style="width: 100px"></div>
<div style="overflow-y: scroll"></div>
<div style="width: 10px; position: relative; z-index: -1"></div>
</div>
</body>
</html>