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diff --git a/layout/reftests/forms/fieldset/fieldset-height-resize-1.html b/layout/reftests/forms/fieldset/fieldset-height-resize-1.html
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+++ b/layout/reftests/forms/fieldset/fieldset-height-resize-1.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+  <title>Testcase, bug 1576864</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+
+  <style>
+
+  fieldset {
+    background: aqua;
+    color: black;
+    position: absolute;
+    top: 20px;
+    left: 20px;
+  }
+
+  </style>
+
+  <script>
+
+    window.onload=function(){
+      document.body.offsetHeight;
+      document.getElementById("set").style.height = "200px";
+    }
+
+  </script>
+
+</head>
+<body>
+
+<fieldset id="set" style="width:200px; height:40px;">
+  This should be in a square.
+</fieldset>
+
+</body>
+</html>