dom/base/test/test_window_extensible.html

   1 <!DOCTYPE html>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=856384
   5 -->
   6 <head>
   7   <meta charset="UTF-8">
   8   <title>Test for Bug 856384</title>
   9   <script src="/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  11 </head>
  12 <body>
  13 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=856384">Mozilla Bug 856384</a>
  14 <p id="display"></p>
  15 <div id="content" style="display: none">
  16 </div>
  17 <iframe name="constructor" src="about:blank"></iframe>
  18 <pre id="test">
  19 <script type="application/javascript">
  20 SimpleTest.waitForExplicitFinish();
  21
  22 function run()
  23 {
  24   is(Object.isExtensible(window), true, "Windows are extensible by default");
  25
  26   try
  27   {
  28     Object.preventExtensions(window);
  29     throw "didn't throw";
  30   }
  31   catch (e)
  32   {
  33     is(e instanceof TypeError, true,
  34        "preventExtensions(window) should throw a TypeError, instead got: " + e);
  35     is(Object.isExtensible(window), true,
  36        'Windows are extensible after an extensibility "change" attempt');
  37   }
  38
  39   SimpleTest.finish();
  40 }
  41
  42 window.addEventListener("load", run);
  43 </script>
  44 </pre>
  45 </body>
  46 </html>