<!doctype html>
<title>The hidden attribute</title>
<link rel=author title=Ms2ger href=mailto:Ms2ger@gmail.com>
<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>
<style>
p { display: none; }
[hidden] { display: block; }
</style>
<p hidden>This line should be visible.