https://slides.com/gkatsev/wpt-webvtt/
The web-platform-tests Project is a W3C-coordinated attempt to build a cross-browser testsuite for the Web-platform stack.
test(function() {
var cue = new VTTCue(3, 12, 'foo bar');
assert_equals(cue.startTime, 3);
assert_equals(cue.endTime, 12);
assert_equals(cue.text, 'foo bar');
assert_equals(cue.id, '');
assert_equals(cue.region, null);
assert_equals(cue.pauseOnExit, false);
assert_equals(cue.snapToLines, true);
assert_equals(cue.line, 'auto');
assert_equals(cue.lineAlign, 'start');
assert_equals(cue.position, 'auto');
assert_equals(cue.positionAlign, 'auto');
assert_equals(cue.size, 100);
assert_equals(cue.align, 'center');
}, document.title + ', initial values');
http://w3c-test.org/webvtt/api/VTTCue/constructor.html
https://github.com/2ndalpha/gasmask
127.0.0.1 xn--lve-6lad.not-web-platform.test
127.0.0.1 xn--lve-6lad.web-platform.test
127.0.0.1 xn--n8j6ds53lwwkrqhv28a.not-web-platform.test
127.0.0.1 www1.web-platform.test
127.0.0.1 www2.web-platform.test
127.0.0.1 not-web-platform.test
127.0.0.1 web-platform.test
127.0.0.1 www2.not-web-platform.test
127.0.0.1 www1.not-web-platform.test
127.0.0.1 www.not-web-platform.test
127.0.0.1 www.web-platform.test
127.0.0.1 xn--n8j6ds53lwwkrqhv28a.web-platform.test