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diff --git a/layout/reftests/forms/fieldset/abs-pos-child-sizing-ref.html b/layout/reftests/forms/fieldset/abs-pos-child-sizing-ref.html
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index 0000000000..405cfaf0a9
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+++ b/layout/reftests/forms/fieldset/abs-pos-child-sizing-ref.html
@@ -0,0 +1,79 @@
+<!DOCTYPE HTML>
+<html><head>
+    <meta charset="utf-8">
+    <title>Testcase for bug 971653</title>
+    <style type="text/css">
+        html,body {
+            color:black; background-color:white; font-size:16px; padding:0; margin:0;
+        }
+
+div {
+    position: absolute;
+    background: rgba(0,255,0,0.5);
+    top:0; bottom:0;
+    left:0; right:0;
+    z-index: 0;
+}
+c {
+    display: block;
+    background: blue;
+    height:100%;
+}
+
+legend { height: 24px; }
+
+fieldset {
+    position: absolute;
+    border: 2px green solid;
+    width: 100px;
+    height: 100px;
+    margin-bottom:40px;
+}
+
+#t1,#t3 { padding: 3px 5px 7px 11px; }
+#t2,#t4 { padding: 0; }
+
+#t1 div, #t3 div {
+    /* same numbers as padding above */
+    left: -11px; right: -5px;
+    top:  -3px;  bottom:-7px;
+}
+
+#t2 { top: 120px; }
+#t3 { top: 240px; }
+#t4 { top: 360px; }
+
+x {
+    position: absolute;
+    width:100px;
+    height:100px;
+}
+#t1 x, #t2 x {
+    height:78px; /* compensate for legend */
+}
+    </style>
+</head>
+<body>
+
+
+<fieldset id="t1">
+    <legend>legend</legend>
+    <x><div></div><c></c></x>
+</fieldset>
+
+<fieldset id="t2">
+    <legend>legend</legend>
+    <x><div></div></x>
+</fieldset>
+
+<fieldset id="t3">
+    <x><div></div><c></c></x>
+</fieldset>
+
+<fieldset id="t4">
+    <x><div></div></x>
+</fieldset>
+
+
+</body>
+</html>