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Test Info:
<html reftest-zoom="2">
<style>
body { background-color: black }
iframe {
width: 100px;
height: 200px;
margin: 0px;
border: 0px;
}
</style>
<body>
<iframe src="unit-vh-vw-iframe.html"></iframe>
<iframe src="unit-vh-vw-iframe.html"></iframe>
</body>
</html>