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<!DOCTYPE html>
<title>HTMLTrackElement Text Track Selection Task Order</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
/**
* This test is used to ensure that we queue 'honor user preferences for automatic
* text track selection' as a macro task, not a micro task. In this test, we
* trigger a media event before queuing a text track selection task, and check
* the text track's mode to know whether the text track selection runs after the
* task for media event.
*/
async_test(function(t) {
let video = document.createElement("video");
video.play();
video.onplay = t.step_func(startedPlay);
// When we create a text track element, it queue a task to run automatic
// text track selection later.
let track = document.createElement("track");
track.default = true;
video.appendChild(track);
assert_equals(track.track.mode, "disabled", "Text track's mode is disabled by default.");
function startedPlay() {
assert_equals(track.track.mode, "disabled", "Text track selection hasn't started yet.");
track.onerror = t.step_func_done(trackError);
}
function trackError() {
assert_equals(track.track.mode, "showing", "Text track selection modified track's mode.");
t.done();
}
});
</script>
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