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+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+ <head>
+ <title>CSS Test: Sticky Positioning - stacking context</title>
+ <link rel="author" title="Corey Ford" href="mailto:cford@mozilla.com">
+ <link rel="match" href="stacking-context-1-ref.html">
+ <meta name="assert" content="Sticky positioning should establish a stacking context">
+ <style>
+ body {
+ margin: 0;
+ }
+ div {
+ width: 100px;
+ height: 100px;
+ }
+ #static {
+ position: absolute;
+ top: 20px;
+ left: 20px;
+ background-color: blue;
+ z-index: 1;
+ }
+ #sticky {
+ position: sticky;
+ top: 0;
+ left: 0;
+ background-color: black;
+ }
+ #inner {
+ position: relative;
+ top: 40px;
+ left: 40px;
+ background-color: gray;
+ z-index: 2;
+ }
+ </style>
+ <body>
+ <div id="static"></div>
+ <div id="sticky">
+ <div id="inner"></div>
+ </div>
+ </body>
+</html>