track-change-event.html (826B)
1 <!DOCTYPE html> 2 <title>A 'change' event is fired when a TextTrack's mode changes</title> 3 <script src="/resources/testharness.js"></script> 4 <script src="/resources/testharnessreport.js"></script> 5 <script> 6 async_test(function(t) { 7 var video = document.createElement('video'); 8 var track = video.addTextTrack('subtitles', 'test', 'en'); 9 10 // addTextTrack() defaults to "hidden", so settings 11 // mode to "showing" should trigger a "change" event. 12 track.mode = 'showing'; 13 assert_equals(video.textTracks.length, 1); 14 15 video.textTracks.onchange = t.step_func_done(function(event) { 16 assert_equals(event.target, video.textTracks); 17 assert_true(event instanceof Event, 'instanceof'); 18 assert_false(event.hasOwnProperty('track'), 'unexpected property found: "track"'); 19 }); 20 }); 21 </script>