track-remove-track-inband.html

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This test has a WPT meta file that disables it given conditions:
- : https://bugzilla.mozilla.org/show_bug.cgi?id=1473478
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/media-elements/track/track-element/track-remove-track-inband.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <script src="/common/media.js"></script>

        <script src="/resources/testharness.js"></script>

        <script src="/resources/testharnessreport.js"></script>

    </head>

    <body>

        <script>

            async_test(function(test)

                var video = document.createElement("video");

                // Create an out-of-band text track by adding a track element.

                var trackElement = document.createElement('track');

                trackElement.addEventListener("error", test.step_func(function()

                    assert_unreached("'error' event on track element should not fire.")

                }));

                video.appendChild(trackElement);

                trackElement.src = 'resources/webvtt-file.vtt';

                trackElement.track.mode = 'hidden';

                assert_equals(video.textTracks.length, 1);

                var outOfBandTrack = video.textTracks[0];

                // Load a media file with an inband text track.

                var inbandTrack = null;

                var url = "resources/vp8-vorbis-webvtt.webm"

                var firstAddTrackHandler = test.step_func(function()

                    assert_equals(event.target, video.textTracks);

                    assert_equals(event instanceof window.TrackEvent, true);

                    if (event.track == outOfBandTrack) {

                        return;

                    assert_equals(inbandTrack, null);

                    assert_equals(video.textTracks.length, 2);

                    assert_equals(event.track, video.textTracks[1]);

                    inbandTrack = event.track;

                    video.textTracks.removeEventListener("addtrack", firstAddTrackHandler);

                    // Clear .src to force the inband track to get destroyed.

                    video.src = "";

                    // Verify that the inband track was removed.

                    assert_not_equals(inbandTrack, null);

                    assert_equals(video.textTracks.length, 1);

                    assert_equals(video.textTracks[0], outOfBandTrack);

                    // Load the URL again to trigger another 'addtrack' event to make sure

                    // no 'removetrack' event was queued.

                    video.src = url;

                    video.textTracks.addEventListener("addtrack", test.step_func(function()

                        assert_equals(video.textTracks.length, 2);

                        test.done();

                    }));

});

                video.textTracks.addEventListener("addtrack", firstAddTrackHandler);

                video.textTracks.addEventListener("removetrack", test.step_func(function()

                    assert_unreached("'removetrack' event should not fire.")

                }));

                video.src = url;

            }, "Tests that the 'removetrack' event is NOT fired for inband TextTrack on a failed load.");

        </script>

    </body>

</html>