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<!DOCTYPE HTML>
<html>
<head>
<title>Test overdraw</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script type="application/javascript">
var domWindowUtils = SpecialPowers.getDOMWindowUtils(window);
var overdraw = domWindowUtils.requestCompositorProperty("overdraw");
if (overdraw == -1) {
// Overdraw queries are not supported on non OMTC builds.
ok(overdraw == -1, "Platform doesn't use a compositor.");
} else {
// Overdraw may be lower than 100% like on OS X where we don't
// composite the window corners.
ok(overdraw > 0.95 && overdraw < 200, "Overdraw: " + overdraw);
}
</script>
</body>
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