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Test Info:

<meta charset="utf-8">
<title>Test for Bug 1451199</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script type="application/javascript">
/** Test for Bug 1451199 **/
addLoadEvent(function() {
// We have to be careful to not check l.matches until the very end
// of the test.
var l = frames[0].matchMedia("(orientation: portrait)");
var iframe = document.querySelector("iframe");
iframe.width = "50";
iframe.contentDocument.documentElement.offsetWidth; // Flush layout
l.addEventListener("change", function() {
is(l.matches, false,
"Should not match portrait by the time we get notified");
iframe.width = "200";
<p id="display"><iframe height="100" width="200"></iframe></p>
<div id="content" style="display: none">
<pre id="test">