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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS will-change: 'will-change: offset-path' creates a stacking context</title>
+<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="https://drafts.fxtf.org/motion-1/#offset-path-property">
+<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: offset-path; 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>