will-change-fixpos-cb-webkit-perspective-1.html

mozilla-central/testing/web-platform/tests/css/css-will-change/will-change-fixpos-cb-webkit-perspective-1.html

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Test Info:

This WPT test may be referenced by the following Test IDs:
- /css/css-will-change/will-change-fixpos-cb-webkit-perspective-1.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CSS will-change: 'will-change: -webkit-perspective' creates a containing block for fixed positioned elements</title>

<link rel="author" title="L. David Baron" href="https://dbaron.org/">

<link rel="author" title="Mozilla" href="http://www.mozilla.org/">

<link rel="author" title="Google" href="https://www.google.com/">

<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">

<link rel="help" href="http://www.w3.org/TR/css3-transforms/#perspective-property">

<link rel="help" href="https://compat.spec.whatwg.org/#css-simple-aliases">

<link rel="match" href="green-square-100-by-100-offset-ref.html">

<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">

<style>

html, body { margin: 0; padding: 0; }

div { width: 100px; height: 100px }

#wc { will-change: -webkit-perspective; margin: 100px 0 0 100px; background: red }

.child { top: 0; left: 0; width: 50px; background: green }

#fixpos { position: fixed }

#abspos { position: absolute; left: 50px }

</style>

<body>

  <div id="wc">

    <div class="child" id="fixpos">

    </div>

    <div class="child" id="abspos">

    </div>

  </div>

</body>