DXR will be turned off on Tuesday, December 29th. It will redirect to Searchfox.
See the announcement on Discourse.

DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d38398e5144e)

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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=428653
-->
<head>
  <title>View Source Test (bug 428653)</title>
  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
</head>
<body>

  <iframe id="content" src="http://example.org/tests/toolkit/components/viewsource/test/file_empty.html"></iframe>

  <script type="application/javascript">
  /*
  Test that we can't call the content browser's document.open() over Xrays.
  See the security checks in nsHTMLDocument::Open, which make sure that the
  entry global's principal matches that of the document.
  */
  SimpleTest.waitForExplicitFinish();

  addLoadEvent(function testDocumentOpen() {
    var browser = document.getElementById("content");
    ok(browser, "got browser");
    var doc = browser.contentDocument;
    ok(doc, "got content document");

    var opened = false;
    try {
      doc.open("text/html", "replace");
      opened = true;
    } catch (e) {
      is(e.name, "SecurityError", "Unexpected exception")
    }
    is(opened, false, "Shouldn't have opened document");

    doc.wrappedJSObject.open("text/html", "replace");
    ok(true, "Should be able to open document via Xray Waiver");

    SimpleTest.finish();
  });
  </script>
</body>
</html>