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+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Positioned Layout Test: an element with 'position: sticky' creates a stacking context</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+  <link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos">
+
+  <meta name="assert" content="This test checks that an element with 'position: sticky' creates a stacking context. In this test, the first 2 divs have the same 'auto' z-index value but since div#sticky is last in document tree order, then it must overlap div#overlapped-red. The final div#overlap-bottom-half-of-sticky exists to make sure that the div#sticky is squeezed, is 'sandwiched' between the other 2.">
+
+  <style>
+  div
+    {
+      height: 100px;
+      width: 100px;
+    }
+
+  div#overlapped-red
+    {
+      background-color: red;
+      position: absolute;
+    }
+
+  div#sticky
+    {
+      background: linear-gradient(to bottom, green 51%, red 49%);
+      position: sticky;
+    }
+
+  div#overlap-bottom-half-of-sticky
+    {
+      background-color: green;
+      bottom: 50px;
+      height: 50px;
+      position: relative;
+    }
+  </style>
+
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.
+
+  <div id="overlapped-red"></div>
+
+  <div id="sticky"></div>
+
+  <div id="overlap-bottom-half-of-sticky"></div>