toolkit/components/extensions/test/xpcshell/data/file_document_write.html
author Ted Campbell <tcampbell@mozilla.com>
Sat, 18 Sep 2021 15:53:59 +0000
changeset 592430 9adcbf4e1bd9385a3128de0501859a3f144cf672
parent 569736 a8f556e08545131cea2a4fd0c5fea44104e131bd
permissions -rw-r--r--
Bug 1731434 - Fix handling of double-faults while throwing overrecursed r=arai The JSContext::generatingError re-entrancy check can generate uncatchable exceptions while throwing errors. Fix ReportOverRecursed to reflect this. Differential Revision: https://phabricator.services.mozilla.com/D126034

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
  <iframe id="iframe"></iframe>

  <script type="text/javascript">
    "use strict";
    addEventListener("load", () => {
      // Send a heap-minimize observer notification so our script cache is
      // cleared, and our content script isn't available for synchronous
      // insertion.
      window.dispatchEvent(new CustomEvent("MozHeapMinimize"));

      let iframe = document.getElementById("iframe");
      let doc = iframe.contentDocument;
      let win = iframe.contentWindow;
      doc.open("text/html");
      // We need to do two writes here. The first creates the document element,
      // which normally triggers parser blocking. The second triggers the
      // creation of the element we're about to query for, which would normally
      // happen asynchronously if the parser were blocked.
      doc.write("<div id=meh>");
      doc.write("<div id=beer></div>");

      let elem = doc.getElementById("beer");
      top.postMessage(elem instanceof win.HTMLDivElement ? "ok" : "fail",
                      "*");

      doc.close();
    }, {once: true});
  </script>
</body>
</html>