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+<!DOCTYPE HTML>
+<title> absolutely positioned element should be vertically centered even if the height is bigger than that of the containing block (reference) - bug 812899</title>
+<style>
+body > div {
+ font-size: 16px;
+ position: relative;
+ border: red solid;
+ margin-top: 5em;
+ width: 5em;
+ height: 5em;
+}
+
+body > div > div {
+ position: absolute;
+ border: medium solid blue;
+ margin: auto auto;
+ height: 150%;
+ width: 150%;
+ left: 0px;
+ right: 0px;
+ top: 0px;
+ bottom: 0px;
+}
+</style>
+
+<body>
+ <div>
+ <div></div>
+ </div>
+</body>
+
+</html>