gecko-dev/testing/web-platform/tests/mediasession/playbackstate.html

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HTML

<!DOCTYPE html>
<title>MediaSession.playbackState attribute</title>
<script src=/resources/testharness.js></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
assert_equals(window.navigator.mediaSession.playbackState, "none");
}, 'Test that playbackState is initialized as "none"');
test(function() {
var states = [ "paused", "playing", "none" ];
for (let state of states) {
window.navigator.mediaSession.playbackState = state;
assert_equals(window.navigator.mediaSession.playbackState, state);
}
}, 'Test that playbackState is read/write');
test(function() {
var invalidStates = [ "invalid", "" ];
for (let state of invalidStates) {
window.navigator.mediaSession.playbackState = state;
assert_equals(window.navigator.mediaSession.playbackState, "none");
}
}, 'Test that warning is thrown when setting invalid playbackState');
</script>