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diff --git a/dom/base/test/test_reentrant_flush.html b/dom/base/test/test_reentrant_flush.html
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+++ b/dom/base/test/test_reentrant_flush.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=709256
+-->
+<head>
+  <title>Test for Bug 709256</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=709256">Mozilla Bug 709256</a>
+<p id="display">
+<iframe id="test"
+        style="width: 100px" src="data:text/html,<body style='width: 100%'>">
+</iframe>
+</p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 709256 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var ifr = $("test");
+  var bod = ifr.contentDocument.body;
+
+  is(bod.getBoundingClientRect().width, 100,
+    "Width of body should be 100px to start with");
+
+  var resizeHandlerRan = false;
+
+  function handleResize() {
+    resizeHandlerRan = true;
+    is(bod.getBoundingClientRect().width, 50,
+       "Width of body should now be 50px");
+  }
+
+  var win = ifr.contentWindow;
+
+  win.addEventListener("resize", handleResize, false);
+  SpecialPowers.setFullZoom(win, 2);
+
+  is(resizeHandlerRan, false,
+     "Resize handler should not have run yet for this test to be valid");
+
+  // Now flush out layout on the subdocument, to trigger the resize handler
+  is(bod.getBoundingClientRect().width, 50, "Width of body should still be 50px");
+
+  is(resizeHandlerRan, true, "Resize handler should have run");
+
+  win.removeEventListener("resize", handleResize, false);
+
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>