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chromium/third_party/blink/web_tests/external/wpt/css/css-will-change/will-change-will-change-1.html 

<!DOCTYPE html>
<title>CSS Test: 'will-change: will-change' is invalid</title>
<link rel="author" title="Cameron McCormack" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="'will-change: will-change' is invalid and thus will not induce a stacking context.">
<style>
div { position: absolute; }
div div { top: 0; left: 0; width: 100px; height: 100px; }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div>
  <div style="will-change: will-change;">
    <div style="background-color: green; z-index: 2;"></div>
  </div>
  <div style="background-color: red; z-index: 1;"></div>
</div>