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<!doctype html>
<html>
<head>
<style>
video {
width: 100px;
height: 100px;
border: 10px solid purple;
}
fieldset {
border: 10px solid blue;
border-color: green;
}
</style>
<script>
</script>
</head>
<body>
<fieldset><video id="x" style="visibility:hidden"></video></fieldset>
</body>
</html>