will-change-stacking-context-mask-1.html

mozilla-central/testing/web-platform/tests/css/css-will-change/will-change-stacking-context-mask-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-stacking-context-mask-1.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CSS will-change: 'will-change: mask' creates a stacking context</title>

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

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

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

<link rel="help" href="http://www.w3.org/TR/css-masking/#the-mask-image">

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

<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">

<style>

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

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

#wc { will-change: mask; background: red }

#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }

</style>

<body>

  <div id="wc">

    <div id="child">

    </div>

  </div>

</body>