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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-canvas-ref.html 

<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: hidden canvas (reference)</title>
<link rel="author" title="Martin Robinson" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">

<style>
div {
  width: 200px;
  height: 200px;
  background: green;
  border: 1px solid black;
}
</style>

<div></div>