<!doctype html>
<title>(Ref #1) CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@mozilla.com">
<link rel="author" title="Cheng You Bai" href="mailto:cyb.ai.815@gmail.com">
<link rel="help" href="https://dom.spec.whatwg.org/#dom-characterdata-replacedata">
<style>.pass { color: green }</style>
<div class="pass">Should be green</div>