dom/bindings/test/test_InstanceOf.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=748983
   5 -->
   6 <head>
   7   <meta charset="utf-8">
   8   <title>Test for Bug 748983</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=748983">Mozilla Bug 748983</a>
  14 <p id="display"></p>
  15 <div id="content" style="display: none">
  16 </div>
  17 <pre id="test">
  18 <script type="application/javascript">
  19
  20 /** Test for Bug 748983 **/
  21
  22 SimpleTest.waitForExplicitFinish();
  23
  24 function runTest() {
  25     ok(document instanceof EventTarget, "document is an event target");
  26     ok(new XMLHttpRequest() instanceof XMLHttpRequest, "instanceof should work on XHR");
  27     ok(HTMLElement.prototype instanceof Node, "instanceof needs to walk the prototype chain");
  28
  29     var otherWin = document.getElementById("testFrame").contentWindow;
  30
  31     ok(otherWin.HTMLElement.prototype instanceof otherWin.Node, "Same-origin instanceof of a interface prototype object should work, even if called cross-origin");
  32     ok(!(otherWin.HTMLElement.prototype instanceof Node), "Cross-origin instanceof of a interface prototype object shouldn't work");
  33
  34     // We need to reset HTMLElement.prototype.__proto__ to the original value
  35     // before using anything from the harness, otherwise the harness code breaks
  36     // in weird ways.
  37     HTMLElement.prototype.__proto__ = otherWin.Element.prototype;
  38     var [ shouldSucceed, shouldFail ] = otherWin.runTest();
  39     shouldSucceed = shouldSucceed && HTMLElement.prototype instanceof otherWin.Element;
  40     shouldFail = shouldFail && HTMLElement.prototype instanceof Element;
  41     HTMLElement.prototype.__proto__ = Element.prototype;
  42
  43     ok(shouldSucceed, "If an interface prototype object is on the protochain then instanceof with the interface object should succeed");
  44     ok(!shouldFail, "If an interface prototype object is not on the protochain then instanceof with the interface object should succeed");
  45
  46     SimpleTest.finish();
  47 }
  48
  49 </script>
  50 </pre>
  51 <iframe id="testFrame" src="file_InstanceOf.html" onload="runTest()"></iframe>
  52 </body>
  53 </html>