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diff --git a/dom/tests/mochitest/bugs/test_bug400204.html b/dom/tests/mochitest/bugs/test_bug400204.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=400204
+-->
+<head>
+ <title>Test for Bug 400204</title>
+ <script type="text/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=400204">Mozilla Bug 400204</a>
+<p id="display"></p>
+<iframe id="content" src="about:blank" style="display: none"></iframe>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+ var c = document.getElementById("content");
+ var success = false;
+ // try to access innerWidth
+ try { success = (c.contentWindow.innerWidth == 0); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerWidth, or it's not 0");
+
+ // try to access innerHeight
+ success = false;
+ try { success = (c.contentWindow.innerHeight == 0); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerHeight, or it's not 0");
+
+ // Snag the canonical getter and setter
+ var innerWidthGetter = Object.getOwnPropertyDescriptor(c.contentWindow, "innerWidth").get;
+ var innerHeightGetter = Object.getOwnPropertyDescriptor(c.contentWindow, "innerHeight").get;
+
+ // try to set innerWidth
+ success = false;
+ try { c.contentWindow.innerWidth = 100; success = true; } catch(ex) { success = false; }
+ ok(success, "can't set hidden iframe innerWidth");
+
+ // try to set innerHeight
+ success = false;
+ try { c.contentWindow.innerHeight = 100; success = true; } catch(ex) { success = false; }
+ ok(success, "can't set hidden iframe innerHeight");
+
+ // now try these again for good measure, and to ensure the values
+ // haven't changed except via getting replaced
+ // try to access innerWidth
+ success = false;
+ try { success = (c.contentWindow.innerWidth == 100); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerWidth, or it's not 100");
+
+ success = false;
+ try { success = (innerWidthGetter.call(c.contentWindow) == 0); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerWidth, or it's not 0");
+
+ // try to access innerHeight
+ success = false;
+ try { success = (c.contentWindow.innerHeight == 100); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerHeight, or it's not 100");
+
+ success = false;
+ try { success = (innerHeightGetter.call(c.contentWindow) == 0); } catch(ex) { success = false; }
+ ok(success, "can't access hidden iframe innerHeight, or it's not 0");
+</script>
+</pre>
+</body>
+</html>