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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<html>
<style>
fieldset {
mask: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciLz4=),
padding-box;
margin-right: 75px;
}
span {
vertical-align: 672in;
}
</style>
<fieldset><span><video></video></span></fieldset>
</html>