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+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS 2.1 Test Suite: Test for z-ordering of inline-block</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/" />
+<link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
+<link rel="help" href="http://www.w3.org/TR/CSS21/zindex.html#painting-order" />
+<style type="text/css">
+div { width: 2em; height: 1em; }
+span { display:inline-block; vertical-align: top; width: 2em; height: 1em; background: green; }
+div#after { margin-top:-1em; background: red; }
+</style>
+</head>
+<body>
+<div><span>&nbsp;</span></div>
+<div id="after">&nbsp;</div>
+</body>
+</html>