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+++ b/layout/reftests/margin-collapsing/block-abs-pos-1-dyn.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+<!-- Note: CSS 2.1 allows guessing the static position of an absolutely
+ positioned element whose offsets are 'auto' (initial value), i.e.
+ the reference of this test is just one of many possible outcomes.
+ See http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width -->
+<style type="text/css">
+#in-flow-top {
+ height: 20px;
+ margin-bottom: 20px;
+ background-color: green;
+}
+#abs-pos {
+ width: 20px; height: 20px;
+ background-color: blue;
+ margin-top: 10px;
+ margin-bottom: 10px;
+}
+#in-flow-bottom {
+ height: 20px;
+ margin-top: 20px;
+ background-color: lightgreen;
+}
+</style>
+<script type="text/javascript">
+function test() {
+ document.getElementById('abs-pos').style.position = 'absolute';
+ document.documentElement.removeAttribute('class');
+}
+document.addEventListener('MozReftestInvalidate', test);
+</script>
+</head>
+<body>
+<div id="in-flow-top"></div>
+<div id="abs-pos"></div>
+<div id="in-flow-bottom"></div>
+</body>
+</html>