gecko-dev/dom/browser-element/mochitest/browserElement_AlertInFrame.js

/* Any copyright is dedicated to the public domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

// Test that alert works from inside an <iframe> inside an <iframe mozbrowser>.
"use strict";

SimpleTest.waitForExplicitFinish();

function runTest() {
  browserElementTestHelpers.setEnabledPref(true);
  browserElementTestHelpers.addPermission();

  var iframe = document.createElement('iframe');
  SpecialPowers.wrap(iframe).mozbrowser = true;

  iframe.addEventListener('mozbrowsershowmodalprompt', function(e) {
    is(e.detail.message, 'Hello');
    SimpleTest.finish();
  });

  iframe.src = 'file_browserElement_AlertInFrame.html';
  document.body.appendChild(iframe);
}

runTest();