test_selectevents.html

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<!doctype html>

<html>

  <head>

    <title>Testing Selection Events</title>

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

    <script src="/tests/SimpleTest/EventUtils.js"></script>

    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

  </head>

  <body>

    <iframe width="500"></iframe>

    <script>

      add_task(async function() {

        // Push the correct preferences for the test

        await SpecialPowers.pushPrefEnv({'set': [

                                          ['dom.select_events.textcontrols.enabled', true],

                                        ]});

        // Start the actual test

        await new Promise((done) => {

          var iframe = document.querySelector('iframe');

          iframe.addEventListener('load', done);

          iframe.setAttribute('src', 'frameSelectEvents.html');

});

        // The child iframe will call add_task before we reach this point,

        // and will handle the rest of the test.

});

    </script>

  </body>

</html>