don't give PositionUpdate::ePeriodicUpdate when seeking, stopping timeMarchesOn() happening for a seek; add wpt for checking correct onenter fires on seek
Differential Revision: https://phabricator.services.mozilla.com/D108987
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1698401
gecko-commit: fa184a5e26d16ed4dbf7249c3f4b28e4ce508408
gecko-reviewers: alwu
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/track-cues-enter-seeking.html b/html/semantics/embedded-content/media-elements/track/track-element/track-cues-enter-seeking.html
new file mode 100644
index 0000000..ae56e16
--- /dev/null
+++ b/html/semantics/embedded-content/media-elements/track/track-element/track-cues-enter-seeking.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<title>TextTrack's cue onenter handler called when seeked onto</title>
+<meta name="timeout" content="long">
+<script src="/common/media.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<video>
+ <track src="resources/cues-chrono-order.vtt" kind="captions" default>
+ <script>
+ // Check that the onenter event is called for the right cue when seeking on the video element.
+ // Based on the spec step 4 [1], after a seek happens, the missed cues should be empty,
+ // so any cues before the target time should not receive enter event.
+ // [1] https://html.spec.whatwg.org/multipage/media.html#time-marches-on
+ async_test(function(t) {
+ var video = document.querySelector("video");
+ var testTrack = document.querySelector("track");
+
+ video.src = getVideoURI("/media/test");
+
+ video.oncanplaythrough = t.step_func(attemptTests);
+
+ function attemptTests() {
+ assert_equals(testTrack.track.cues.length, 3);
+ const targetTime = 4.0000000004;
+
+ for (let cue of testTrack.track.cues) {
+ if (cue.endTime > targetTime) {
+ cue.onenter = t.step_func(_=>t.done());
+ } else {
+ cue.onenter = t.unreached_func("onenter called for wrong cue");
+ }
+ }
+
+ video.currentTime = targetTime;
+ }
+ });
+ </script>
+</video>
