script: Parse vtt payload for track elements

TimvdLippe · servo-wpt-sync · commit 37cd7ff74eb9 · 2026-07-18T20:40:07.000+02:00
This uses the payload retrieved by the fetch to construct the list of cues to be added to the track. Part of #46288 Testing: new passing WPT tests Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/resources/header-empty-after.vtt b/html/semantics/embedded-content/media-elements/track/track-element/resources/header-empty-after.vtt
@@ -0,0 +1 @@
+WEBVTT
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/resources/header-invalid-equal.vtt b/html/semantics/embedded-content/media-elements/track/track-element/resources/header-invalid-equal.vtt
@@ -0,0 +1 @@
+HEADER
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/resources/header-newlines-after.vtt b/html/semantics/embedded-content/media-elements/track/track-element/resources/header-newlines-after.vtt
@@ -0,0 +1,4 @@
+WEBVTT
+
+
+
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/resources/header-too-short.vtt b/html/semantics/embedded-content/media-elements/track/track-element/resources/header-too-short.vtt
@@ -0,0 +1 @@
+WEBVT
diff --git a/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-header-checks.html b/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-header-checks.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<title>Check handling of header lengths and name</title>
+<script src="track-helpers.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<video>
+    <track src="resources/header-empty-after.vtt">
+    <track src="resources/header-newlines-after.vtt">
+    <track src="resources/header-too-short.vtt">
+    <track src="resources/header-invalid-equal.vtt">
+</video>
+<script>
+async_test(function(t) {
+    var video = document.querySelector("video");
+
+    var trackElements = document.querySelectorAll("track");
+    trackElements[0].onload = t.step_func(trackLoaded);
+    trackElements[1].onload = t.step_func(trackLoaded);
+    trackElements[2].onerror = t.step_func(trackLoaded);
+    trackElements[3].onerror = t.step_func(trackLoaded);
+
+    enableAllTextTracks(video.textTracks);
+
+    var numberOfTracksLoaded = 0;
+    function trackLoaded() {
+        numberOfTracksLoaded++;
+        if (numberOfTracksLoaded != trackElements.length)
+            return;
+
+        for (let i = 0; i < trackElements.length; i++) {
+            assert_cues_equal(video.textTracks[i].cues, []);
+        }
+
+        t.done();
+    }
+});
+</script>

-Original file line number
+Diff line change
@@ @@ -0,0 +1,4 @@ @@
 +WEBVTT
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