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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: hidden-matchable and size contained (reference)</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#attr-hidden-until-found">
<style>
div {
border: 1px solid black;
}
</style>
Test passes if there is a empty div with border below.
<div></div>
</html>