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chromium/third_party/blink/web_tests/external/wpt/html/editing/the-hidden-attribute/hidden-1c.html 

<!doctype html>
<title>The hidden attribute</title>
<link rel=match href=hidden-1-ref.html>
<link rel=author title=Ms2ger href=mailto:[email protected]>
<link rel=help href=https://html.spec.whatwg.org/multipage/#the-hidden-attribute>
<link rel=help href=https://html.spec.whatwg.org/multipage/#hidden-elements>
<p hidden>This line should be visible.
<p>This line should not be visible.
<script>
document.getElementsByTagName("p")[0].hidden = false;
document.getElementsByTagName("p")[1].hidden = true;
</script>