From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/media/webvtt/test/crashtests/1304948.html      |   33 +
 dom/media/webvtt/test/crashtests/1319486.html      |   27 +
 dom/media/webvtt/test/crashtests/1533909.html      |   17 +
 dom/media/webvtt/test/crashtests/882549.html       |   13 +
 dom/media/webvtt/test/crashtests/894104.html       |   20 +
 dom/media/webvtt/test/crashtests/crashtests.list   |    5 +
 dom/media/webvtt/test/mochitest/bad-signature.vtt  |    1 +
 dom/media/webvtt/test/mochitest/basic.vtt          |   29 +
 dom/media/webvtt/test/mochitest/bug883173.vtt      |   16 +
 dom/media/webvtt/test/mochitest/long.vtt           | 8001 ++++++++++++++++++++
 dom/media/webvtt/test/mochitest/manifest.js        |   27 +
 dom/media/webvtt/test/mochitest/mochitest.ini      |   50 +
 dom/media/webvtt/test/mochitest/parser.vtt         |    6 +
 dom/media/webvtt/test/mochitest/region.vtt         |    6 +
 dom/media/webvtt/test/mochitest/sequential.vtt     |   10 +
 .../webvtt/test/mochitest/test_bug1018933.html     |   50 +
 .../webvtt/test/mochitest/test_bug1242594.html     |   46 +
 .../webvtt/test/mochitest/test_bug883173.html      |   39 +
 .../webvtt/test/mochitest/test_bug895091.html      |   60 +
 .../webvtt/test/mochitest/test_bug957847.html      |   30 +
 .../mochitest/test_testtrack_cors_no_response.html |   41 +
 .../webvtt/test/mochitest/test_texttrack.html      |  158 +
 .../test_texttrack_cors_preload_none.html          |   40 +
 .../test_texttrack_mode_change_during_loading.html |   75 +
 .../webvtt/test/mochitest/test_texttrack_moz.html  |   60 +
 .../webvtt/test/mochitest/test_texttrackcue.html   |  298 +
 .../test/mochitest/test_texttrackcue_moz.html      |   34 +
 .../test/mochitest/test_texttrackevents_video.html |   91 +
 .../webvtt/test/mochitest/test_texttracklist.html  |   51 +
 .../test/mochitest/test_texttracklist_moz.html     |   34 +
 .../test/mochitest/test_texttrackregion.html       |   57 +
 .../test/mochitest/test_trackelementevent.html     |   77 +
 .../test/mochitest/test_trackelementsrc.html       |   53 +
 .../webvtt/test/mochitest/test_trackevent.html     |   69 +
 .../webvtt/test/mochitest/test_vttparser.html      |   44 +
 .../mochitest/test_webvtt_empty_displaystate.html  |   98 +
 .../mochitest/test_webvtt_event_same_time.html     |   63 +
 .../test_webvtt_infinite_processing_loop.html      |   49 +
 .../mochitest/test_webvtt_overlapping_time.html    |  100 +
 .../test/mochitest/test_webvtt_positionalign.html  |  113 +
 .../webvtt/test/mochitest/test_webvtt_seeking.html |  110 +
 ...pdate_display_after_adding_or_removing_cue.html |   93 +
 .../webvtt/test/mochitest/vttPositionAlign.vtt     |   86 +
 dom/media/webvtt/test/reftest/black.mp4            |  Bin 0 -> 15036 bytes
 .../test/reftest/cues_time_overlapping.webvtt      |    7 +
 dom/media/webvtt/test/reftest/reftest.list         |    3 +
 .../test/reftest/vtt_overlapping_time-ref.html     |   29 +
 .../webvtt/test/reftest/vtt_overlapping_time.html  |   30 +
 .../test/reftest/vtt_reflow_display-ref.html       |   28 +
 .../webvtt/test/reftest/vtt_reflow_display.css     |   33 +
 .../webvtt/test/reftest/vtt_reflow_display.html    |   37 +
 .../vtt_update_display_after_removed_cue.html      |   36 +
 .../vtt_update_display_after_removed_cue_ref.html  |    6 +
 dom/media/webvtt/test/reftest/white.webm           |  Bin 0 -> 10880 bytes
 dom/media/webvtt/test/xpcshell/test_parser.js      |  158 +
 dom/media/webvtt/test/xpcshell/xpcshell.ini        |    3 +
 56 files changed, 10750 insertions(+)
 create mode 100644 dom/media/webvtt/test/crashtests/1304948.html
 create mode 100644 dom/media/webvtt/test/crashtests/1319486.html
 create mode 100644 dom/media/webvtt/test/crashtests/1533909.html
 create mode 100644 dom/media/webvtt/test/crashtests/882549.html
 create mode 100644 dom/media/webvtt/test/crashtests/894104.html
 create mode 100644 dom/media/webvtt/test/crashtests/crashtests.list
 create mode 100644 dom/media/webvtt/test/mochitest/bad-signature.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/basic.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/bug883173.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/long.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/manifest.js
 create mode 100644 dom/media/webvtt/test/mochitest/mochitest.ini
 create mode 100644 dom/media/webvtt/test/mochitest/parser.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/region.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/sequential.vtt
 create mode 100644 dom/media/webvtt/test/mochitest/test_bug1018933.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_bug1242594.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_bug883173.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_bug895091.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_bug957847.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_testtrack_cors_no_response.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrack.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrack_cors_preload_none.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrack_mode_change_during_loading.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrack_moz.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrackcue.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrackcue_moz.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrackevents_video.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttracklist.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttracklist_moz.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_texttrackregion.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_trackelementevent.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_trackelementsrc.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_trackevent.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_vttparser.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_empty_displaystate.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_event_same_time.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_infinite_processing_loop.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_overlapping_time.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_positionalign.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_seeking.html
 create mode 100644 dom/media/webvtt/test/mochitest/test_webvtt_update_display_after_adding_or_removing_cue.html
 create mode 100644 dom/media/webvtt/test/mochitest/vttPositionAlign.vtt
 create mode 100644 dom/media/webvtt/test/reftest/black.mp4
 create mode 100644 dom/media/webvtt/test/reftest/cues_time_overlapping.webvtt
 create mode 100644 dom/media/webvtt/test/reftest/reftest.list
 create mode 100644 dom/media/webvtt/test/reftest/vtt_overlapping_time-ref.html
 create mode 100644 dom/media/webvtt/test/reftest/vtt_overlapping_time.html
 create mode 100644 dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html
 create mode 100644 dom/media/webvtt/test/reftest/vtt_reflow_display.css
 create mode 100644 dom/media/webvtt/test/reftest/vtt_reflow_display.html
 create mode 100644 dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue.html
 create mode 100644 dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue_ref.html
 create mode 100644 dom/media/webvtt/test/reftest/white.webm
 create mode 100644 dom/media/webvtt/test/xpcshell/test_parser.js
 create mode 100644 dom/media/webvtt/test/xpcshell/xpcshell.ini

(limited to 'dom/media/webvtt/test')

diff --git a/dom/media/webvtt/test/crashtests/1304948.html b/dom/media/webvtt/test/crashtests/1304948.html
new file mode 100644
index 0000000000..667a13d06a
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/1304948.html
@@ -0,0 +1,33 @@
+<html class="reftest-wait">
+<head>
+  <title> Bug 1304948 : Crash if a texttrack remove a cue not belongs to it. </title>
+</head>
+<meta charset="utf-8">
+<script type="text/javascript">
+
+window.onload = function() {
+  var a = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
+  a.src = "";
+  document.body.appendChild(a);
+  var b = a.addTextTrack('chapters', "AAAAAAAAAAAAAAAA", "de");
+  var c = new VTTCue(0.6, 0.3, "AA");
+  b.addCue(c);
+  var d = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
+  var e = d.addTextTrack('chapters', "AAAA", "en-US");
+  a.currentTime = 2;
+  a.play();
+  try {
+    // This will queue a TimeMarchesOn task on mainthread, so use
+    // timer to wait the TimeMarchesOn crash.
+    e.removeCue(c);
+  } catch (e) {
+    if (e.name == "NotFoundError") {
+      setTimeout(function() {
+        document.documentElement.removeAttribute("class");}, 0);
+	  }
+  }
+};
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/crashtests/1319486.html b/dom/media/webvtt/test/crashtests/1319486.html
new file mode 100644
index 0000000000..74bdb2147c
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/1319486.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title> Bug 1319486 : Crash if a texttrackcue added to different texttracks. </title>
+</head>
+<body>
+<video id=v1></video>
+<video id=v2></video>
+</body>
+<meta charset="utf-8">
+<script type="text/javascript">
+
+addEventListener('DOMContentLoaded', function(){
+  let cue,tt1,tt2;
+  v1.play();
+  tt1 = v1.addTextTrack('metadata', "", "");
+  v1.play();
+  v1.currentTime = 8;
+  cue = new VTTCue(0, 0.5, "");
+  tt1.addCue(cue);
+  tt2 = v2.addTextTrack('captions', "", "");
+  tt2.addCue(cue);
+  tt2.removeCue(cue);
+  tt1.addCue(new VTTCue(0.7, 2, ""));
+});
+</script>
+</html>
diff --git a/dom/media/webvtt/test/crashtests/1533909.html b/dom/media/webvtt/test/crashtests/1533909.html
new file mode 100644
index 0000000000..ee73ecb7b8
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/1533909.html
@@ -0,0 +1,17 @@
+<script>
+function eh1() {
+  d.track.addCue(new VTTCue(0.01, 0.69, "Y"))
+}
+function eh2() {
+  a.currentTime = 0.43
+  c.addEventListener("DOMNodeRemoved", eh1)
+  a.append(b)
+  a.appendChild(c)
+}
+</script>
+<canvas id="c">
+<q id="b">
+</canvas>
+<audio id="a" src="data:audio/mpeg;base64,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">
+<track id="d"></track>
+<iframe onload="eh2()">
diff --git a/dom/media/webvtt/test/crashtests/882549.html b/dom/media/webvtt/test/crashtests/882549.html
new file mode 100644
index 0000000000..8a720c3e11
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/882549.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <script>
+            var o0 = new VTTCue(0.000, 1.000, 'Bug882549');
+            var o1 = o0.getCueAsHTML();
+        </script>
+    </head>
+    <body>
+    </body>
+</html>
+<script>
+</script>
diff --git a/dom/media/webvtt/test/crashtests/894104.html b/dom/media/webvtt/test/crashtests/894104.html
new file mode 100644
index 0000000000..d021994e74
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/894104.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+
+function boom()
+{
+  var frame = document.getElementById("f");
+  var frameWin = frame.contentWindow;
+  frameWin.VTTCue;
+  document.body.removeChild(frame);
+  new frameWin.VTTCue(0, 1, "Bug 894104").getCueAsHTML();
+}
+
+</script>
+</head>
+
+<body onload="boom();"><iframe id="f" src="data:text/html,1"></iframe></body>
+</html>
diff --git a/dom/media/webvtt/test/crashtests/crashtests.list b/dom/media/webvtt/test/crashtests/crashtests.list
new file mode 100644
index 0000000000..c9776984bc
--- /dev/null
+++ b/dom/media/webvtt/test/crashtests/crashtests.list
@@ -0,0 +1,5 @@
+load 1304948.html
+load 1319486.html
+load 1533909.html
+load 882549.html
+load 894104.html
diff --git a/dom/media/webvtt/test/mochitest/bad-signature.vtt b/dom/media/webvtt/test/mochitest/bad-signature.vtt
new file mode 100644
index 0000000000..c9a59b35e9
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/bad-signature.vtt
@@ -0,0 +1 @@
+WEB
diff --git a/dom/media/webvtt/test/mochitest/basic.vtt b/dom/media/webvtt/test/mochitest/basic.vtt
new file mode 100644
index 0000000000..45646ab868
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/basic.vtt
@@ -0,0 +1,29 @@
+WEBVTT
+REGION
+id:testOne lines:2 width:30%
+REGION
+id:testTwo lines:4 width:20%
+
+1
+00:00.500 --> 00:00.700 region:testOne
+This
+
+2
+00:01.200 --> 00:02.400 region:testTwo
+Is
+
+2.5
+00:02.000 --> 00:03.500 region:testOne
+(Over here?!)
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+5
+00:03.217 --> 00:03.989
+And more!
diff --git a/dom/media/webvtt/test/mochitest/bug883173.vtt b/dom/media/webvtt/test/mochitest/bug883173.vtt
new file mode 100644
index 0000000000..61f086bcce
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/bug883173.vtt
@@ -0,0 +1,16 @@
+WEBVTT
+
+00:03.000 --> 00:04.000
+Should display fifth.
+
+00:01.000 --> 00:02.000
+Should display first.
+
+00:01.000 --> 00:03.000
+Should display second.
+
+00:02.000 --> 00:04.000
+Should display forth.
+
+00:02.000 --> 00:03.000
+Should display third.
diff --git a/dom/media/webvtt/test/mochitest/long.vtt b/dom/media/webvtt/test/mochitest/long.vtt
new file mode 100644
index 0000000000..23984b0c8d
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/long.vtt
@@ -0,0 +1,8001 @@
+WEBVTT
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
+4
+00:03.217 --> 00:03.989
+Test
+
+1
+00:00.500 --> 00:00.700
+This
+
+2
+00:01.200 --> 00:02.400
+Is
+
+3
+00:02.710 --> 00:02.910
+A
+
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diff --git a/dom/media/webvtt/test/mochitest/manifest.js b/dom/media/webvtt/test/mochitest/manifest.js
new file mode 100644
index 0000000000..91c481feb9
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/manifest.js
@@ -0,0 +1,27 @@
+// Force releasing decoder to avoid timeout in waiting for decoding resource.
+function removeNodeAndSource(n) {
+  n.remove();
+  // reset |srcObject| first since it takes precedence over |src|.
+  n.srcObject = null;
+  n.removeAttribute("src");
+  n.load();
+  while (n.firstChild) {
+    n.firstChild.remove();
+  }
+}
+
+function once(target, name, cb) {
+  var p = new Promise(function (resolve, reject) {
+    target.addEventListener(
+      name,
+      function () {
+        resolve();
+      },
+      { once: true }
+    );
+  });
+  if (cb) {
+    p.then(cb);
+  }
+  return p;
+}
diff --git a/dom/media/webvtt/test/mochitest/mochitest.ini b/dom/media/webvtt/test/mochitest/mochitest.ini
new file mode 100644
index 0000000000..ee905144b8
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/mochitest.ini
@@ -0,0 +1,50 @@
+[DEFAULT]
+subsuite = media
+tags = webvtt
+skip-if = (os == "win" && processor == "aarch64") # aarch64 due to 1536604
+support-files =
+  ../../../test/gizmo.mp4
+  ../../../test/seek.webm
+  ../../../test/vp9cake.webm
+  bad-signature.vtt
+  basic.vtt
+  bug883173.vtt
+  long.vtt
+  manifest.js
+  parser.vtt
+  region.vtt
+  sequential.vtt
+  vttPositionAlign.vtt
+
+[test_bug1018933.html]
+[test_bug1242594.html]
+[test_bug883173.html]
+skip-if = (android_version == '25' && debug) # android(bug 1232305)
+[test_bug895091.html]
+skip-if = (android_version == '25' && debug) # android(bug 1232305)
+[test_bug957847.html]
+skip-if = (android_version == '25' && debug) # android(bug 1232305)
+[test_trackelementevent.html]
+[test_trackelementsrc.html]
+[test_texttrack.html]
+[test_texttrackcue.html]
+[test_texttrackcue_moz.html]
+[test_trackevent.html]
+[test_texttrackevents_video.html]
+[test_texttracklist.html]
+[test_texttracklist_moz.html]
+[test_texttrackregion.html]
+[test_testtrack_cors_no_response.html]
+[test_texttrack_cors_preload_none.html]
+[test_texttrack_mode_change_during_loading.html]
+skip-if = true
+  toolkit == 'android' # Bug 1636572, android(bug 1562021)
+[test_texttrack_moz.html]
+[test_vttparser.html]
+[test_webvtt_empty_displaystate.html]
+[test_webvtt_event_same_time.html]
+[test_webvtt_infinite_processing_loop.html]
+[test_webvtt_overlapping_time.html]
+[test_webvtt_positionalign.html]
+[test_webvtt_seeking.html]
+[test_webvtt_update_display_after_adding_or_removing_cue.html]
diff --git a/dom/media/webvtt/test/mochitest/parser.vtt b/dom/media/webvtt/test/mochitest/parser.vtt
new file mode 100644
index 0000000000..2a56c65f80
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/parser.vtt
@@ -0,0 +1,6 @@
+WEBVTT
+
+00:00.500 --> 00:00.700
+Test
+00:00.500 --> 00:00.700
+Stuff
diff --git a/dom/media/webvtt/test/mochitest/region.vtt b/dom/media/webvtt/test/mochitest/region.vtt
new file mode 100644
index 0000000000..1e351dbcfb
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/region.vtt
@@ -0,0 +1,6 @@
+WEBVTT
+REGION
+id:fred width:62% lines:5 regionanchor:4%,78% viewportanchor:10%,90% scroll:up
+
+00:01.000 --> 00:02.000 region:fred
+Test here.
diff --git a/dom/media/webvtt/test/mochitest/sequential.vtt b/dom/media/webvtt/test/mochitest/sequential.vtt
new file mode 100644
index 0000000000..94e92e38ae
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/sequential.vtt
@@ -0,0 +1,10 @@
+WEBVTT
+
+00:01.000 --> 00:02.000
+This
+
+00:03.000 --> 00:04.000
+Is
+
+00:05.000 --> 00:06.000
+A Test
diff --git a/dom/media/webvtt/test/mochitest/test_bug1018933.html b/dom/media/webvtt/test/mochitest/test_bug1018933.html
new file mode 100644
index 0000000000..bff1db6021
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_bug1018933.html
@@ -0,0 +1,50 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1018933
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Regression test for bug 1018933 - HTMLTrackElement should create only one TextTrack</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+video.src = "seek.webm";
+video.preload = "auto";
+
+var trackElement = document.createElement("track");
+trackElement.src = "basic.vtt";
+trackElement.kind = "subtitles";
+
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+
+// Accessing the track now would have caused the bug as the track element
+// shouldn't have had time to bind to the tree yet.
+trackElement.track.mode = 'showing';
+
+video.addEventListener("loadedmetadata", function run_tests() {
+  // Re-que run_tests() at the end of the event loop until the track
+  // element has loaded its data.
+  if (trackElement.readyState == 1) {
+    setTimeout(run_tests, 0);
+    return;
+  }
+
+  is(video.textTracks.length, 1, "Video should have one TextTrack.");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_bug1242594.html b/dom/media/webvtt/test/mochitest/test_bug1242594.html
new file mode 100644
index 0000000000..25c47948bb
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_bug1242594.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1242594
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Bug 1242594 - Unbind a video element with HTMLTrackElement
+  should not remove the TextTrack</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+video.src = "seek.webm";
+video.preload = "auto";
+
+var trackElement = document.createElement("track");
+trackElement.src = "basic.vtt";
+trackElement.kind = "subtitles";
+
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+
+// Bug 1242599, access video.textTracks.length immediately after
+// the track element binds into the media element.
+is(video.textTracks.length, 1, "Video should have one TextTrack.");
+var parent = video.parentNode;
+parent.removeChild(video);
+is(video.textTracks.length, 1, "After unbind the video element, should have one TextTrack.");
+parent.appendChild(video);
+is(video.textTracks.length, 1, "After bind the video element, should have one TextTrack.");
+SimpleTest.finish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_bug883173.html b/dom/media/webvtt/test/mochitest/test_bug883173.html
new file mode 100644
index 0000000000..6e95f4e3ca
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_bug883173.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 883173 - TextTrackCue(List) Sorting</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="metadata">
+  <track src="bug883173.vtt" kind="subtitles" id="default" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to ensure that the cues in the cue list should be sorted by
+ * cues' start time and end time, not the present order in the file.
+ */
+function runTest() {
+  let trackElement = document.getElementById("default");
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+
+  let expected = [[1, 3], [1, 2], [2, 4], [2, 3], [3, 4]];
+  let cueList = trackElement.track.cues;
+  is(cueList.length, expected.length, "Cue list length should be 5.");
+
+  for (let i = 0; i < expected.length; i++) {
+    is(cueList[i].startTime, expected[i][0],
+       `Cue's start time should be ${expected[i][0]}`);
+    is(cueList[i].endTime, expected[i][1],
+       `Cue's end time should be ${expected[i][1]}`);
+  }
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = runTest;
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_bug895091.html b/dom/media/webvtt/test/mochitest/test_bug895091.html
new file mode 100644
index 0000000000..6fa2629283
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_bug895091.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 895091 - Integrating vtt.js</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="metadata">
+  <track src="long.vtt" kind="subtitles" id="track1">
+  <track src="long.vtt" kind="subtitles" id="track2">
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to ensure that we can load two track elements with large
+ * amount of cues at same time. In this test, both tracks are disable by default,
+ * we have to enable them in order to start loading.
+ */
+var trackElement = document.getElementById("track1");
+var trackElementTwo = document.getElementById("track2");
+
+async function runTest() {
+  enableBothTracks();
+  await waitUntilBothTracksLoaded();
+  checkTrackReadyStateShouldBeLoaded();
+  checkCuesAmount();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = runTest;
+
+/**
+ * The following are test helper functions.
+ */
+function enableBothTracks() {
+  // All tracks are `disable` on default. As we won't start loading for disabled
+  // tracks, we have to change their mode in order to start loading.
+  trackElement.track.mode = "hidden";
+  trackElementTwo.track.mode = "hidden";
+}
+
+async function waitUntilBothTracksLoaded() {
+  info(`wait until both tracks finish loading`);
+  await Promise.all([once(trackElement, "load"), once(trackElementTwo, "load")]);
+}
+
+function checkTrackReadyStateShouldBeLoaded() {
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  is(trackElementTwo.readyState, 2, "Track::ReadyState should be set to LOADED.");
+}
+
+function checkCuesAmount() {
+  is(trackElement.track.cues.length, 2000, "Cue list length should be 2000.");
+  is(trackElementTwo.track.cues.length, 2000, "Cue list length should be 2000.");
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_bug957847.html b/dom/media/webvtt/test/mochitest/test_bug957847.html
new file mode 100644
index 0000000000..8bbea81bf9
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_bug957847.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=957847
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Regression test for bug 957847 - Crash on TextTrack::AddCue </title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var trackElement = document.createElement('track');
+trackElement.track.addCue(new VTTCue(0, 1, "A"));
+
+// We need to assert something for Mochitest to be happy.
+ok(true);
+SimpleTest.finish();
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_testtrack_cors_no_response.html b/dom/media/webvtt/test/mochitest/test_testtrack_cors_no_response.html
new file mode 100644
index 0000000000..e047f74eb3
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_testtrack_cors_no_response.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Should not load CORS vtt file when server doesn't respond with correct CORS header</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video preload="none" crossorigin="anonymous">
+  <track src="http://example.com/tests/dom/canvas/test/crossorigin/video.sjs?name=tests/dom/media/webvtt/test/mochitest/basic.vtt&type=text/vtt" kind="subtitles" id="default" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to ensure that we shouldn't load CORS resource if server
+ * doesn't respond with correct CORS header. In this situation, loading should
+ * be expected to fail.
+ */
+async function runTest() {
+  await waitUntiTrackLoadError();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+/**
+ * The following are test helper functions.
+ */
+async function waitUntiTrackLoadError() {
+  const trackElement = document.getElementById("default");
+  if (trackElement.readyState != 3) {
+    info(`wait until receiving error event`);
+    await once(trackElement, "error");
+  }
+  is(trackElement.readyState, 3, "Track::ReadyState should be set to ERROR.");
+  is(trackElement.track.cues.length, 0, "Cue list length should be 0.");
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrack.html b/dom/media/webvtt/test/mochitest/test_texttrack.html
new file mode 100644
index 0000000000..69c4f24bec
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrack.html
@@ -0,0 +1,158 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 833386 - TextTrackList</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v">
+<script type="text/javascript">
+/**
+ * This test is used to check different things.
+ * (1) the default value of track element's attributes
+ * (2) readonly attributes can't be modifted
+ * (3) the order of tracks in the media element's track list
+ */
+var enabledTrackElement = null;
+
+async function runTest() {
+  addFourTextTrackElementsToVideo();
+  startLoadingVideo();
+  await waitUntilEnableTrackLoaded();
+  checkTracksStatus();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = runTest;
+
+/**
+ * The following are test helper functions.
+ */
+function addFourTextTrackElementsToVideo() {
+  let video = document.getElementById("v");
+  isnot(video.textTracks, undefined,
+        "HTMLMediaElement::TextTrack() property should be available.")
+
+  let trackList = video.textTracks;
+  is(trackList.length, 0, "Length should be 0.");
+
+  ok(typeof video.addTextTrack == "function",
+     "HTMLMediaElement::AddTextTrack() function should be available.")
+
+  // Insert some tracks in an order that is not sorted, we will test if they
+  // are sorted later.
+  info(`- Add a track element with label 'third' -`);
+  video.addTextTrack("subtitles", "third", "en-CA");
+  is(trackList.length, 1, "Length should be 1.");
+
+  let textTrack = video.textTracks[0];
+  checkAttributesDefaultValue(textTrack);
+  checkTextTrackMode(textTrack);
+  checkReadOnlyAttributes(textTrack);
+
+  info(`- Add a track element with label 'first' -`);
+  let trackOne = document.createElement("track");
+  video.appendChild(trackOne);
+  trackOne.label = "first";
+  trackOne.src = "basic.vtt";
+  trackOne.default = true;
+  trackOne.id = "2";
+  // The automatic track selection would choose the first track element with
+  // `default` attribute, so this track would be enable later.
+  enabledTrackElement = trackOne;
+
+  info(`- Add a track element with label 'fourth' -`);
+  video.addTextTrack("subtitles", "fourth", "en-CA");
+
+  info(`- Add a track element with label 'second' -`);
+  let trackTwo = document.createElement("track");
+  video.appendChild(trackTwo);
+  trackTwo.label = "second";
+  trackTwo.src = "basic.vtt";
+  // Although this track has `default` attribute as well, it won't be enable by
+  // the automatic track selection because it's not the first default track in
+  // the media element's track list.
+  trackTwo.default = true;
+}
+
+function checkAttributesDefaultValue(track) {
+  is(track.label, "third", "Label should be set to third.");
+  is(track.language, "en-CA", "Language should be en-CA.");
+  is(track.kind, "subtitles", "Default kind should be subtitles.");
+  is(track.mode, "hidden", "Default mode should be hidden.");
+}
+
+function checkTextTrackMode(track) {
+  // Mode should not allow a bogus value.
+  track.mode = 'bogus';
+  is(track.mode, 'hidden', "Mode should be not allow a bogus value.");
+
+  // Should allow all these values for mode.
+  changeTextTrackMode("showing");
+  changeTextTrackMode("disabled");
+  changeTextTrackMode("hidden");
+
+  function changeTextTrackMode(mode) {
+    track.mode = mode;
+    is(track.mode, mode, `Mode should allow \"${mode}\"`);
+  }
+}
+
+function checkReadOnlyAttributes(track) {
+  // All below are read-only properties and so should not allow setting.
+  track.label = "French subtitles";
+  is(track.label, "third", "Label is read-only so should still be \"label\".");
+  track.language = "en";
+  is(track.language, "en-CA", "Language is read-only so should still be \"en-CA\".");
+  track.kind = "captions";
+  is(track.kind, "subtitles", "Kind is read-only so should still be \"subtitles\"");
+}
+
+function startLoadingVideo() {
+  let video = document.getElementById("v");
+  video.src = "seek.webm";
+  video.preload = "metadata";
+}
+
+async function waitUntilEnableTrackLoaded() {
+  info(`wait until the enabled track finishes loading`);
+  await once(enabledTrackElement, "load");
+  is(enabledTrackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+}
+
+function checkTracksStatus() {
+  // We're testing two things here,
+  // (1) the tracks created from a track element have a default mode 'disabled'
+  // and tracks created from 'addTextTrack' method have a default
+  // mode of 'hidden'.
+  // (2) we're testing that the tracks are sorted properly. For the tracks to
+  // be sorted the first two tracks, added through a TrackElement, must occupy
+  // the first two indexes in their TrackElement tree order. The second two
+  // tracks, added through the 'addTextTrack' method, will occupy the last two
+  // indexes in the order that they were added in.
+  let trackData = [
+    { label: "first", mode: "showing", id: "2" },
+    { label: "second", mode: "disabled", id: "" },
+    { label: "third", mode: "hidden", id: "" },
+    { label: "fourth", mode: "hidden", id: "" }
+  ];
+  let video = document.getElementById("v");
+  is(video.textTracks.length, trackData.length,
+     `TextTracks length should be ${trackData.length}`);
+  for (let i = 0; i < trackData.length; i++) {
+    let track = video.textTracks[i];
+    isnot(track, null, `Video should have a text track at index ${i}`);
+    let info = trackData[i];
+    for (let key in info) {
+      is(track[key], info[key],
+         `Track at index ${i} should have a '${key}' property with a value of '${info[key]}'.`);
+    }
+  }
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrack_cors_preload_none.html b/dom/media/webvtt/test/mochitest/test_texttrack_cors_preload_none.html
new file mode 100644
index 0000000000..6743e8c4cd
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrack_cors_preload_none.html
@@ -0,0 +1,40 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>load CORS Text track correctly when its parent media element's preload is none</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video preload="none" crossorigin="anonymous">
+  <track src="http://example.com/tests/dom/canvas/test/crossorigin/video.sjs?name=tests/dom/media/webvtt/test/mochitest/basic.vtt&type=text/vtt&cors=anonymous" kind="subtitles" id="default" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to test the text track element with CORS resource can starts
+ * loaded correctly when its parent media element's preload attribute is none.
+ */
+async function runTest() {
+  await waitUntiTrackLoaded();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+/**
+ * The following are test helper functions.
+ */
+async function waitUntiTrackLoaded() {
+  let trackElement = document.getElementById("default");
+  if (trackElement.readyState != 2) {
+    info(`wait until the track finishes loading`);
+    await once(trackElement, "load");
+  }
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrack_mode_change_during_loading.html b/dom/media/webvtt/test/mochitest/test_texttrack_mode_change_during_loading.html
new file mode 100644
index 0000000000..974f452092
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrack_mode_change_during_loading.html
@@ -0,0 +1,75 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebVTT : changing track's mode during loading</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+/**
+ * This test is to ensure that we won't get `error` event when we change track's
+ * mode during loading. In this test, track element starts loading after setting
+ * the src and we would start another load later just after the channel which is
+ * used to fetch data starts. The second load is triggered by mode changes, and
+ * it should stop the prevous load and won't generate any error.
+ */
+async function startTest() {
+  const video = createVideo();
+  const trackElement = createAndAppendtrackElemententToVideo(video);
+
+  await changeTrackModeDuringLoading(trackElement);
+  await waitUntilTrackLoaded(trackElement);
+
+  removeNodeAndSource(video);
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [["media.webvtt.testing.events", true]]},
+                            startTest);
+
+/**
+ * The following are test helper functions.
+ */
+function createVideo() {
+  info(`create video`);
+  let video = document.createElement("video");
+  video.src = "gizmo.mp4";
+  document.body.appendChild(video);
+  return video;
+}
+
+function createAndAppendtrackElemententToVideo(video) {
+  let trackElement = document.createElement("track");
+  trackElement.default = true;
+  video.append(trackElement);
+  return trackElement;
+}
+
+async function changeTrackModeDuringLoading(trackElement) {
+  info(`set src to start loading`);
+  trackElement.src = "basic.vtt";
+
+  info(`wait until starting loading resource.`);
+  await once(trackElement, "mozStartedLoadingTextTrack");
+
+  info(`changeing track's mode during loading should not cause loading failed.`);
+  trackElement.onerror = () => {
+    ok(false, `Should not get error event!`);
+  }
+  trackElement.track.mode = "hidden";
+}
+
+async function waitUntilTrackLoaded(trackElement) {
+  if (trackElement.readyState != 2) {
+    info(`wait until the track finishes loading`);
+    await once(trackElement, "load");
+  }
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrack_moz.html b/dom/media/webvtt/test/mochitest/test_texttrack_moz.html
new file mode 100644
index 0000000000..b39562b3a4
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrack_moz.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 881976 - TextTrackList</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="metadata">
+<script type="text/javascript">
+/**
+ * This test is used to ensure the text track list we got from video is as same
+ * as the one in the text track.
+ */
+var video = document.getElementById("v");
+
+async function runTest() {
+  addTrackViaAddTrackAPI();
+  await addTrackViaTrackElement();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = runTest;
+
+/**
+ * The following are test helper functions.
+ */
+function addTrackViaAddTrackAPI() {
+  // Check if adding a text track manually sets the TextTrackList correctly.
+  video.addTextTrack("subtitles", "", "");
+  // TextTrack.textTrackList is an extension available only to privileged code,
+  // so we need to access it through the SpecialPowers object.
+  is(SpecialPowers.unwrap(SpecialPowers.wrap(video.textTracks[0]).textTrackList),
+     video.textTracks,
+     "The Track's TextTrackList should be the Video's TextTrackList.");
+}
+
+async function addTrackViaTrackElement() {
+  // Check if loading a Track via a TrackElement sets the TextTrackList correctly.
+  let trackElement = document.createElement("track");
+  trackElement.src = "basic.vtt";
+  trackElement.kind = "subtitles";
+  trackElement.default = true;
+  video.appendChild(trackElement);
+
+  info(`wait until the track finishes loading`);
+  await once(trackElement, "load");
+
+  is(trackElement.readyState, HTMLTrackElement.LOADED,
+     "Track::ReadyState should be set to LOADED.");
+  is(SpecialPowers.unwrap(SpecialPowers.wrap(trackElement.track).textTrackList),
+     video.textTracks,
+     "TrackElement's Track's TextTrackList should be the Video's TextTrackList.");
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrackcue.html b/dom/media/webvtt/test/mochitest/test_texttrackcue.html
new file mode 100644
index 0000000000..3d9783c07d
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrackcue.html
@@ -0,0 +1,298 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 833386 - HTMLTrackElement</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="metadata">
+  <track src="basic.vtt" kind="subtitles" id="default" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to test the VTTCue's different behaviors and check whether
+ * cues would be activatived correctly during video playback.
+ */
+var video = document.getElementById("v");
+var trackElement = document.getElementById("default");
+
+async function runTest() {
+  await waitUntiTrackLoaded();
+  checkCueDefinition();
+  checkFirstCueParsedContent();
+  checkCueStartTimeAndEndtime();
+  checkCueSizeAndPosition();
+  checkCueSnapToLines();
+  checkCueAlignmentAndWritingDirection();
+  checkCueLine();
+  checkCreatingNewCue();
+  checkRemoveNonExistCue();
+  checkActiveCues();
+  checkCueRegion();
+  await checkCActiveCuesDuringVideoPlaying();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [["media.webvtt.regions.enabled", true]]},
+                            runTest);
+/**
+ * The following are test helper functions.
+ */
+async function waitUntiTrackLoaded() {
+  if (trackElement.readyState != 2) {
+    info(`wait until the track finishes loading`);
+    await once(trackElement, "load");
+  }
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
+}
+
+function checkCueDefinition() {
+  // Check that the typedef of TextTrackCue works in Gecko.
+  isnot(window.TextTrackCue, undefined, "TextTrackCue should be defined.");
+  isnot(window.VTTCue, undefined, "VTTCue should be defined.");
+}
+
+function checkFirstCueParsedContent() {
+  // Check if first cue was parsed correctly.
+  const cue = trackElement.track.cues[0];
+  ok(cue instanceof TextTrackCue, "Cue should be an instanceof TextTrackCue.");
+  ok(cue instanceof VTTCue, "Cue should be an instanceof VTTCue.");
+  is(cue.id, "1", "Cue's ID should be 1.");
+  is(cue.startTime, 0.5, "Cue's start time should be 0.5.");
+  is(cue.endTime, 0.7, "Cue's end time should be 0.7.");
+  is(cue.pauseOnExit, false, "Cue's pause on exit flag should be false.");
+  is(cue.text, "This", "Cue's text should be set correctly.");
+  is(cue.track, trackElement.track, "Cue's track should be defined.");
+  cue.track = null;
+  isnot(cue.track, null, "Cue's track should not be able to be set.");
+}
+
+function checkCueStartTimeAndEndtime() {
+  const cueList = trackElement.track.cues;
+  // Check that all cue times were not rounded
+  is(cueList[1].startTime, 1.2, "Second cue's start time should be 1.2.");
+  is(cueList[1].endTime, 2.4, "Second cue's end time should be 2.4.");
+  is(cueList[2].startTime, 2, "Third cue's start time should be 2.");
+  is(cueList[2].endTime, 3.5, "Third cue's end time should be 3.5.");
+  is(cueList[3].startTime, 2.71, "Fourth cue's start time should be 2.71.");
+  is(cueList[3].endTime, 2.91, "Fourth cue's end time should be 2.91.");
+  is(cueList[4].startTime, 3.217, "Fifth cue's start time should be 3.217.");
+  is(cueList[4].endTime, 3.989, "Fifth cue's end time should be 3.989.");
+  is(cueList[5].startTime, 3.217, "Sixth cue's start time should be 3.217.");
+  is(cueList[5].endTime, 3.989, "Sixth cue's end time should be 3.989.");
+
+  // Check that Cue setters are working correctly.
+  const cue = trackElement.track.cues[0];
+  cue.id = "Cue 01";
+  is(cue.id, "Cue 01", "Cue's ID should be 'Cue 01'.");
+  cue.startTime = 0.51;
+  is(cue.startTime, 0.51, "Cue's start time should be 0.51.");
+  cue.endTime = 0.71;
+  is(cue.endTime, 0.71, "Cue's end time should be 0.71.");
+  cue.pauseOnExit = true;
+  is(cue.pauseOnExit, true, "Cue's pause on exit flag should be true.");
+  video.addEventListener("pause", function() {
+    video.play();
+  }, {once: true});
+}
+
+function checkCueSizeAndPosition() {
+  function checkPercentageValue(prop, initialVal) {
+    ok(prop in cue, prop + " should be a property on VTTCue.");
+    cue[prop] = initialVal;
+    is(cue[prop], initialVal, `Cue's ${prop} should initially be ${initialVal}`);
+    [ 101, -1 ].forEach(function(val) {
+      let exceptionHappened = false;
+      try {
+        cue[prop] = val;
+      } catch(e) {
+        exceptionHappened = true;
+        is(e.name, "IndexSizeError", "Should have thrown IndexSizeError.");
+      }
+      ok(exceptionHappened, "Exception should have happened.");
+    });
+  }
+
+  const cue = trackElement.track.cues[0];
+  checkPercentageValue("size", 100.0);
+  cue.size = 50.5;
+  is(cue.size, 50.5, "Cue's size should be 50.5.")
+
+  // Check cue.position
+  checkPercentageValue("position", "auto");
+  cue.position = 50.5;
+  is(cue.position, 50.5, "Cue's position value should now be 50.5.");
+}
+
+function checkCueSnapToLines() {
+  const cue = trackElement.track.cues[0];
+  ok(cue.snapToLines, "Cue's snapToLines should be set by set.");
+  cue.snapToLines = false;
+  ok(!cue.snapToLines, "Cue's snapToLines should not be set.");
+}
+
+function checkCueAlignmentAndWritingDirection() {
+  function checkEnumValue(prop, initialVal, acceptedValues) {
+    ok(prop in cue, `${prop} should be a property on VTTCue.`);
+    is(cue[prop], initialVal, `Cue's ${prop} should be ${initialVal}`);
+    cue[prop] = "bogus";
+    is(cue[prop], initialVal, `Cue's ${prop} should be ${initialVal}`);
+    acceptedValues.forEach(function(val) {
+      cue[prop] = val;
+      is(cue[prop], val, `Cue's ${prop} should be ${val}`);
+      if (typeof val === "string") {
+        cue[prop] = val.toUpperCase();
+        is(cue[prop], val, `Cue's ${prop} should be ${val}`);
+      }
+    });
+  }
+
+  const cue = trackElement.track.cues[0];
+  checkEnumValue("align", "center", [ "start", "left", "center", "right", "end" ]);
+  checkEnumValue("lineAlign", "start", [ "start", "center", "end" ]);
+  checkEnumValue("vertical", "", [ "", "lr", "rl" ]);
+
+  cue.lineAlign = "center";
+  is(cue.lineAlign, "center", "Cue's line align should be center.");
+  cue.lineAlign = "START";
+  is(cue.lineAlign, "center", "Cue's line align should be center.");
+  cue.lineAlign = "end";
+  is(cue.lineAlign, "end", "Cue's line align should be end.");
+
+  // Check that cue position align works properly
+  is(cue.positionAlign, "auto", "Cue's default position alignment should be auto.");
+
+  cue.positionAlign = "line-left";
+  is(cue.positionAlign, "line-left", "Cue's position align should be line-left.");
+  cue.positionAlign = "auto";
+  is(cue.positionAlign, "auto", "Cue's position align should be auto.");
+  cue.positionAlign = "line-right";
+  is(cue.positionAlign, "line-right", "Cue's position align should be line-right.");
+}
+
+function checkCueLine() {
+  const cue = trackElement.track.cues[0];
+  // Check cue.line
+  is(cue.line, "auto", "Cue's line value should initially be auto.");
+  cue.line = 0.5;
+  is(cue.line, 0.5, "Cue's line value should now be 0.5.");
+  cue.line = "auto";
+  is(cue.line, "auto", "Cue's line value should now be auto.");
+}
+
+function checkCreatingNewCue() {
+  const cueList = trackElement.track.cues;
+
+  // Check that we can create and add new VTTCues
+  let vttCue = new VTTCue(3.999, 4, "foo");
+  is(vttCue.track, null, "Cue's track should be null.");
+  trackElement.track.addCue(vttCue);
+  is(vttCue.track, trackElement.track, "Cue's track should be defined.");
+  is(cueList.length, 7, "Cue list length should now be 7.");
+
+  // Check that new VTTCue was added correctly
+  let cue = cueList[6];
+  is(cue.startTime, 3.999, "Cue's start time should be 3.999.");
+  is(cue.endTime, 4, "Cue's end time should be 4.");
+  is(cue.text, "foo", "Cue's text should be foo.");
+
+  // Adding the same cue again should not increase the cue count.
+  trackElement.track.addCue(vttCue);
+  is(cueList.length, 7, "Cue list length should be 7.");
+
+  // Check that we are able to remove cues.
+  trackElement.track.removeCue(cue);
+  is(cueList.length, 6, "Cue list length should be 6.");
+}
+
+function checkRemoveNonExistCue() {
+  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
+  let exceptionHappened = false;
+  try {
+    // We should not be able to remove a cue that is not in the list.
+    trackElement.track.removeCue(new VTTCue(1, 2, "foo"));
+  } catch (e) {
+    // "NotFoundError" should be thrown when trying to remove a cue that is
+    // not in the list.
+    is(e.name, "NotFoundError", "Should have thrown NotFoundError.");
+    exceptionHappened = true;
+  }
+  // If this is false then we did not throw an error and probably removed a cue
+  // when we shouln't have.
+  ok(exceptionHappened, "Exception should have happened.");
+  is(trackElement.track.cues.length, 6, "Cue list length should still be 6.");
+}
+
+function checkActiveCues() {
+  video.currentTime = 2;
+  isnot(trackElement.track.activeCues, null);
+
+  trackElement.track.mode = "disabled";
+  is(trackElement.track.activeCues, null, "No active cue when track is disabled.");
+  trackElement.track.mode = "showing";
+}
+
+function checkCueRegion() {
+  let regionInfo = [
+    { lines: 2, width: 30 },
+    { lines: 4, width: 20 },
+    { lines: 2, width: 30 }
+  ];
+
+  for (let i = 0; i < regionInfo.length; i++) {
+    let cue = trackElement.track.cues[i];
+    isnot(cue.region, null, `Cue at ${i} should have a region.`);
+    for (let key in regionInfo[i]) {
+      is(cue.region[key], regionInfo[i][key],
+         `Region should have a ${key} property with a value of ${regionInfo[i][key]}`);
+    }
+  }
+}
+
+async function checkCActiveCuesDuringVideoPlaying() {
+  // Test TextTrack::ActiveCues.
+  let cueInfo = [
+    { startTime: 0.51, endTime: 0.71, ids: ["Cue 01"] },
+    { startTime: 0.72, endTime: 1.19, ids: [] },
+    { startTime: 1.2, endTime: 1.9, ids: [2] },
+    { startTime: 2, endTime: 2.4, ids: [2, 2.5] },
+    { startTime: 2.41, endTime: 2.70, ids: [2.5] },
+    { startTime: 2.71, endTime: 2.91, ids: [2.5, 3] },
+    { startTime: 2.92, endTime: 3.216, ids: [2.5] },
+    { startTime: 3.217, endTime: 3.5, ids: [2.5, 4, 5] },
+    { startTime: 3.51, endTime: 3.989, ids: [4, 5] },
+    { startTime: 3.99, endTime: 4, ids: [] }
+  ];
+
+  video.addEventListener("timeupdate", function() {
+    let activeCues = trackElement.track.activeCues,
+        playbackTime = video.currentTime;
+
+    for (let i = 0; i < cueInfo.length; i++) {
+      let cue = cueInfo[i];
+      if (playbackTime >= cue.startTime && playbackTime < cue.endTime) {
+        is(activeCues.length, cue.ids.length, `There should be ${cue.ids.length} currently active cue(s).`);
+        for (let j = 0; j < cue.ids.length; j++) {
+          isnot(activeCues.getCueById(cue.ids[j]), undefined,
+                `The cue with ID ${cue.ids[j]} should be active.`);
+        }
+        break;
+      }
+    }
+  });
+
+  info(`start video from 0s.`);
+  video.currentTime = 0;
+  video.play();
+  await once(video, "playing");
+  info(`video starts playing.`);
+  await once(video, "ended");
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrackcue_moz.html b/dom/media/webvtt/test/mochitest/test_texttrackcue_moz.html
new file mode 100644
index 0000000000..29f6661f85
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrackcue_moz.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=967157
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Test for Bug 967157 - Setting TextTrackCue::DisplayState should set TextTrackCue::HasBeenReset to false</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+  SimpleTest.waitForExplicitFinish();
+
+  var cue = SpecialPowers.wrap(new VTTCue(0, 1, "Some text."));
+  is(cue.hasBeenReset, false, "Cue's hasBeenReset flag should be false.");
+  is(cue.displayState, null, "Cue's displayState should be null.");
+
+  cue.startTime = 0.5;
+  is(cue.hasBeenReset, true, "Cue's hasBeenReset flag should now be true.");
+
+  cue.displayState = document.createElement("div");
+  is(cue.hasBeenReset, false, "Cue's hasBeenReset flag should now be false.");
+
+  SimpleTest.finish();
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrackevents_video.html b/dom/media/webvtt/test/mochitest/test_texttrackevents_video.html
new file mode 100644
index 0000000000..83104633a4
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrackevents_video.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Tests for TextTrack DOM Events</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+video.src = "vp9cake.webm";
+video.preload = "auto";
+video.controls = true;
+var trackElement = document.createElement("track");
+trackElement.src = "sequential.vtt";
+trackElement.kind = "subtitles";
+trackElement.default = true;
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+
+var trackElementCueChangeCount = 0;
+var trackCueChangeCount = 0;
+var cueEnterCount = 0;
+var cueExitCount = 0;
+
+video.addEventListener("loadedmetadata", function run_tests() {
+  // Re-queue run_tests() at the end of the event loop until the track
+  // element has loaded its data.
+  if (trackElement.readyState == 1) {
+    setTimeout(run_tests, 0);
+    return;
+  }
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  ok('oncuechange' in trackElement.track, "Track::OnCueChange should exist.");
+
+  var textTrack = trackElement.track;
+  is(textTrack.cues.length, 3, "textTrack.cues.length should 3.");
+  textTrack.cues[0].onenter = function() {
+    ++cueEnterCount;
+  };
+  textTrack.cues[0].onexit = function() {
+    ++cueExitCount;
+  };
+  textTrack.cues[1].onenter = function() {
+    ++cueEnterCount;
+  };
+  textTrack.cues[1].onexit = function() {
+    ++cueExitCount;
+  };
+  textTrack.cues[2].onenter = function() {
+    ++cueEnterCount;
+  };
+  textTrack.cues[2].onexit = function() {
+    ++cueExitCount;
+  };
+
+  trackElement.track.oncuechange = function() {
+    ++trackElementCueChangeCount;
+  };
+
+  trackElement.addEventListener("cuechange", function() {
+    ++trackCueChangeCount;
+  });
+
+  video.play();
+});
+
+video.addEventListener('ended', function() {
+  // Should be fired 1 to 6 times, as there are 3 cues,
+  // with a change event for when it is activated/deactivated
+  // (6 events at most).
+  isnot(trackElementCueChangeCount, 0, "TrackElement should fire cue change at least one time.");
+  ok(trackElementCueChangeCount <= 6, 'trackElementCueChangeCount should <= 6');
+  isnot(trackCueChangeCount, 0, "TrackElement.track should fire cue change at least one time.");
+  ok(trackCueChangeCount <= 6, 'trackCueChangeCount should <= 6');
+  is(cueEnterCount, 3, "cueEnterCount should fire three times.");
+  is(cueExitCount, 3, "cueExitCount should fire three times.");
+  SimpleTest.finish()
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttracklist.html b/dom/media/webvtt/test/mochitest/test_texttracklist.html
new file mode 100644
index 0000000000..c1d2296289
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttracklist.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=882703
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Media test: TextTrackList change event</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+let video = document.createElement("video");
+
+isnot(video.textTracks, null, "Video should have a list of TextTracks.");
+
+video.addTextTrack("subtitles", "", "");
+
+let track = video.textTracks[0];
+video.textTracks.addEventListener("change", changed);
+
+is(track.mode, "hidden", "New TextTrack's mode should be hidden.");
+track.mode = "showing";
+// Bug882674: change the mode again to see if we receive only one
+// change event.
+track.mode = "hidden";
+
+var eventCount = 0;
+function changed(event) {
+  eventCount++;
+  is(eventCount, 1, "change event dispatched multiple times.");
+  is(event.target, video.textTracks, "change event's target should be video.textTracks.");
+  ok(event instanceof window.Event, "change event should be a simple event.");
+  ok(!event.bubbles, "change event should not bubble.");
+  ok(event.isTrusted, "change event should be trusted.");
+  ok(!event.cancelable, "change event should not be cancelable.");
+
+  // Delay the finish function call for testing the change event count.
+  setTimeout(SimpleTest.finish, 0);
+}
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttracklist_moz.html b/dom/media/webvtt/test/mochitest/test_texttracklist_moz.html
new file mode 100644
index 0000000000..6cae8323fd
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttracklist_moz.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=881976
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Test for Bug 881976 - TextTrackCue Computed Position</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+var trackList = video.textTracks;
+ok(trackList instanceof TextTrackList,
+   "Video's textTracks should be a TextTrackList");
+var trackParent = SpecialPowers.unwrap(
+    SpecialPowers.wrap(trackList).mediaElement
+);
+is(trackParent, video,
+   "Video's TextTrackList's MediaElement reference should be set to the video.");
+SimpleTest.finish();
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_texttrackregion.html b/dom/media/webvtt/test/mochitest/test_texttrackregion.html
new file mode 100644
index 0000000000..f41c404445
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_texttrackregion.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 917945 - VTTRegion</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="auto">
+  <track src="region.vtt" kind="subtitles" id="default" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is used to ensure that we can parse VTT region attributes correctly
+ * from vtt file.
+ */
+var trackElement = document.getElementById("default");
+
+async function runTest() {
+  await waitUntiTrackLoaded();
+  checkRegionAttributes();
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [["media.webvtt.regions.enabled", true]]},
+                            runTest);
+/**
+ * The following are test helper functions.
+ */
+async function waitUntiTrackLoaded() {
+  if (trackElement.readyState != 2) {
+    info(`wait until the track finishes loading`);
+    await once(trackElement, "load");
+  }
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+}
+
+function checkRegionAttributes() {
+  let cues = trackElement.track.cues;
+  is(cues.length, 1, "Cue list length should be 1.");
+
+  let region = cues[0].region;
+  isnot(region, null, "Region should not be null.");
+  is(region.width, 62, "Region width should be 50.");
+  is(region.lines, 5, "Region lines should be 5.");
+  is(region.regionAnchorX, 4, "Region regionAnchorX should be 4.");
+  is(region.regionAnchorY, 78, "Region regionAnchorY should be 78.");
+  is(region.viewportAnchorX, 10, "Region viewportAnchorX should be 10.");
+  is(region.viewportAnchorY, 90, "Region viewportAnchorY should be 90.");
+  is(region.scroll, "up", "Region scroll should be 'up'");
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_trackelementevent.html b/dom/media/webvtt/test/mochitest/test_trackelementevent.html
new file mode 100644
index 0000000000..f78033a89d
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_trackelementevent.html
@@ -0,0 +1,77 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 882677 - Implement the 'sourcing out of band text tracks' algorithm</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id="v" src="seek.webm" preload="auto">
+<script type="text/javascript">
+/**
+ * This test is used to ensure that we can load resource from vtt files correctly
+ * and will dispatch `error` event for invalid vtt files.
+ */
+var video = document.getElementById("v");
+
+async function runTest() {
+  let tracks = createTextTrackElements();
+  appendTracksToVideo(tracks);
+  await waitUntilsTrackLoadedOrGetError(tracks);
+  SimpleTest.finish()
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = runTest;
+
+/**
+ * The following are test helper functions.
+ */
+function createTextTrackElements() {
+  // Only first track has valid vtt resource, other tracks should get the error
+  // event because of invalid vtt resources.
+  let trackOne = document.createElement("track");
+  trackOne.src = "basic.vtt";
+  trackOne.kind = "subtitles";
+  trackOne.expectedLoaded = true;
+
+  let trackTwo = document.createElement("track");
+  trackTwo.src = "bad-signature.vtt";
+  trackTwo.kind = "captions";
+  trackTwo.expectedLoaded = false;
+
+  let trackThree = document.createElement("track");
+  trackThree.src = "bad.vtt";
+  trackThree.kind = "chapters";
+  trackThree.expectedLoaded = false;
+
+  return [trackOne, trackTwo, trackThree];
+}
+
+function appendTracksToVideo(tracks) {
+  for (let track of tracks) {
+    video.appendChild(track);
+  }
+}
+
+async function waitUntilsTrackLoadedOrGetError(tracks) {
+  let promises = [];
+  for (let track of tracks) {
+    // explictly enable those track in order to start loading.
+    track.track.mode = "hidden";
+    if (track.expectedLoaded) {
+      info(`adding 'load' event to wait list.`);
+      promises.push(once(track, "load"));
+    } else {
+      info(`adding 'error' event to wait list.`);
+      promises.push(once(track, "error"));
+    }
+  }
+  info(`wait until tracks finish loading or get error.`);
+  await Promise.all(promises);
+  ok(true, "all tracks finish loading or get error.");
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_trackelementsrc.html b/dom/media/webvtt/test/mochitest/test_trackelementsrc.html
new file mode 100644
index 0000000000..f98e79c605
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_trackelementsrc.html
@@ -0,0 +1,53 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1281418 - Change the src attribue for TrackElement.</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+SpecialPowers.pushPrefEnv({"set": [["media.webvtt.regions.enabled", true]]},
+  function() {
+    var video = document.createElement("video");
+    video.src = "seek.webm";
+    video.preload = "metadata";
+    var trackElement = document.createElement("track");
+    trackElement.src = "basic.vtt";
+    trackElement.default = true;
+
+    document.getElementById("content").appendChild(video);
+    video.appendChild(trackElement);
+
+    video.addEventListener("loadedmetadata", function metadata() {
+      if (trackElement.readyState <= 1) {
+        setTimeout(metadata, 0);
+        return;
+      }
+      is(video.textTracks.length, 1, "Length should be 1.");
+      is(video.textTracks[0].cues.length, 6, "Cue length should be 6.");
+
+      trackElement.src = "sequential.vtt";
+      trackElement.track.mode = "showing";
+      video.play();
+    });
+
+    video.addEventListener("ended", function end() {
+      is(trackElement.readyState, 2, "readyState should be 2.")
+      is(video.textTracks.length, 1, "Length should be 1.");
+      is(video.textTracks[0].cues.length, 3, "Cue length should be 3.");
+      SimpleTest.finish();
+    });
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_trackevent.html b/dom/media/webvtt/test/mochitest/test_trackevent.html
new file mode 100644
index 0000000000..ffba7d33ec
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_trackevent.html
@@ -0,0 +1,69 @@
+
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 893309 - Implement TrackEvent</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+isnot(video.textTracks, undefined, "HTMLMediaElement::TextTrack() property should be available.")
+ok(typeof video.addTextTrack == "function", "HTMLMediaElement::AddTextTrack() function should be available.")
+
+var trackList = video.textTracks;
+is(trackList.length, 0, "Length should be 0.");
+
+var evtTextTrack, numOfCalls = 0, tt;
+trackList.onaddtrack = function(event) {
+  ok(event instanceof TrackEvent, "Fired event from onaddtrack should be a TrackEvent");
+  is(event.type, "addtrack", "Event type should be addtrack");
+  ok(event.isTrusted, "Event should be trusted!");
+  ok(!event.bubbles, "Event shouldn't bubble!");
+  ok(!event.cancelable, "Event shouldn't be cancelable!");
+
+  evtTextTrack = event.track;
+  tt = textTrack[numOfCalls].track || textTrack[numOfCalls];
+
+  ok(tt === evtTextTrack, "Text tracks should be the same");
+  is(evtTextTrack.label, label[numOfCalls], "Label should be set to "+ label[numOfCalls]);
+  is(evtTextTrack.language, language[numOfCalls], "Language should be " + language[numOfCalls]);
+  is(evtTextTrack.kind, kind[numOfCalls], "Kind should be " + kind[numOfCalls]);
+
+  if (++numOfCalls == 4) {
+    SimpleTest.finish();
+  }
+};
+
+var label = ["Oasis", "Coldplay", "t.A.T.u", ""];
+var language = ["en-CA", "en-GB", "ru", ""];
+var kind = ["subtitles", "captions", "chapters", "subtitles"];
+
+var textTrack = new Array(4);
+for (var i = 0; i < 3; ++i) {
+  textTrack[i] = video.addTextTrack(kind[i], label[i], language[i]);
+  is(trackList.length, i + 1, "Length should be " + (i+1));
+}
+
+video.src = "seek.webm";
+video.preload = "auto";
+var trackElement = document.createElement("track");
+trackElement.src = "basic.vtt";
+textTrack[3] = trackElement;
+
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+
+//TODO: Tests for removetrack event to be added along with bug 882677
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_vttparser.html b/dom/media/webvtt/test/mochitest/test_vttparser.html
new file mode 100644
index 0000000000..419723a1d4
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_vttparser.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset='utf-8'>
+  <title>WebVTT Parser Regression Tests</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+video.src = "seek.webm";
+video.preload = "auto";
+
+var trackElement = document.createElement("track");
+trackElement.src = "parser.vtt";
+trackElement.kind = "subtitles";
+trackElement.default = true;
+
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+video.addEventListener("loadedmetadata", function run_tests() {
+  // Re-que run_tests() at the end of the event loop until the track
+  // element has loaded its data.
+  if (trackElement.readyState == 1) {
+    setTimeout(run_tests, 0);
+    return;
+  }
+
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  is(trackElement.track.cues.length, 2, "Track should have two Cues.");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_empty_displaystate.html b/dom/media/webvtt/test/mochitest/test_webvtt_empty_displaystate.html
new file mode 100644
index 0000000000..e1a8ddc555
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_empty_displaystate.html
@@ -0,0 +1,98 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset='utf-8'>
+  <title>WebVTT : cue's displaystate should be empty when its active flag is unset</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div id="content">
+</div>
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var isReceivedOnEnterEvent = false;
+var isReceivedOnExitEvent = false;
+
+function checkCueEvents() {
+  ok(isReceivedOnEnterEvent, "Already received cue's onEnter event.");
+  ok(isReceivedOnExitEvent, "Already received cue's onExit event.");
+  SimpleTest.finish();
+}
+
+function checkCueDisplayState(cue, expectedState) {
+  var cueChrome = SpecialPowers.wrap(cue);
+  if (expectedState) {
+    ok(cueChrome.displayState, "Cue's displayState shouldn't be empty.");
+  } else {
+    ok(!cueChrome.displayState, "Cue's displayState should be empty.");
+  }
+}
+
+function runTest() {
+  info("--- create video ---");
+  var video = document.createElement("video");
+  video.src = "seek.webm";
+  video.autoplay = true;
+  document.getElementById("content").appendChild(video);
+
+  video.onended = function () {
+    video.onended = null;
+    checkCueEvents();
+  };
+
+  video.onpause = function () {
+    video.onpause = null;
+    checkCueEvents();
+  }
+
+  video.onloadedmetadata = function () {
+    ok(video.duration > 2, "video.duration should larger than 2");
+  }
+
+  info("--- create the type of track ---");
+  isnot(window.TextTrack, undefined, "TextTrack should be defined.");
+
+  var track = video.addTextTrack("subtitles", "A", "en");
+  track.mode = "showing";
+  ok(track instanceof TextTrack, "Track should be an instanceof TextTrack.");
+
+  info("--- check the type of cue ---");
+  isnot(window.TextTrackCue, undefined, "TextTrackCue should be defined.");
+  isnot(window.VTTCue, undefined, "VTTCue should be defined.");
+
+  var cue = new VTTCue(1, 2, "Test cue");
+  ok(cue instanceof TextTrackCue, "Cue should be an instanceof TextTrackCue.");
+  ok(cue instanceof VTTCue, "Cue should be an instanceof VTTCue.");
+
+  info("--- add cue ---");
+  track.addCue(cue);
+  video.ontimeupdate = function () {
+    info("--- video.currentTime is " + video.currentTime);
+  };
+  cue.onenter = function () {
+    cue.onenter = null;
+    isReceivedOnEnterEvent = true;
+    var cueChrome = SpecialPowers.wrap(cue);
+    info("cueChrome.getActive " + cueChrome.getActive);
+    if (cueChrome.getActive) {
+      checkCueDisplayState(cue, true /* has display-state */);
+    } else {
+      info("This is a missing cue, video.currentTime is "+ video.currentTime);
+    }
+
+    cue.onexit = function () {
+      cue.onexit = null;
+      isReceivedOnExitEvent = true;
+      checkCueDisplayState(cue, false /* no display-state */);
+      video.pause();
+    }
+  }
+}
+
+onload = runTest;
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_event_same_time.html b/dom/media/webvtt/test/mochitest/test_webvtt_event_same_time.html
new file mode 100644
index 0000000000..e70ff558e1
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_event_same_time.html
@@ -0,0 +1,63 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset='utf-8'>
+  <title>WebVTT : cue's onenter/onexit event order </title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div id="content">
+</div>
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var c1exit = false;
+var c3enter = false;
+
+function runTest() {
+  info("--- create video ---");
+  var video = document.createElement("video");
+  video.src = "seek.webm";
+  video.autoplay = true;
+  document.getElementById("content").appendChild(video);
+
+  var track = video.addTextTrack("subtitles", "A", "en");
+  track.mode = "showing";
+
+  var cue1 = new VTTCue(1, 2, "Test cue1");
+  var cue2 = new VTTCue(2, 3, "Test cue2");
+  track.addCue(cue1);
+  track.addCue(cue2);
+
+  cue1.onexit = function () {
+    cue1.onexit = null;
+    c1exit = true;
+  }
+  cue2.onenter = function () {
+    cue2.onenter = null;
+    ok(c1exit, "cue1 onexit event before than cue2 onenter");
+    video.pause();
+    SimpleTest.finish();
+  }
+
+  var cue3 = new VTTCue(1, 2, "Test cue3");
+  var cue4 = new VTTCue(1, 2, "Test cue4");
+  track.addCue(cue3);
+  track.addCue(cue4);
+
+  cue3.onenter = function () {
+    cue3.onenter = null;
+    c3enter = true;
+  }
+  cue4.onenter = function () {
+    cue4.onenter = null;
+    ok(c3enter, "cue3 onenter event before than cue4 onenter");
+  }
+}
+
+onload = runTest;
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_infinite_processing_loop.html b/dom/media/webvtt/test/mochitest/test_webvtt_infinite_processing_loop.html
new file mode 100644
index 0000000000..c8a9380ca2
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_infinite_processing_loop.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1580015 - video hangs infinitely during playing subtitle</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style>
+    .container {
+      width: 500px;
+      height: 300px;
+      background: pink;
+      display: flex;
+      justify-content: center;
+    }
+
+    video {
+      min-width: 95%;
+      max-width: 95%;
+      max-height: 95%;
+    }
+  </style>
+</head>
+<body>
+<div class="container">
+<video id="v" src="gizmo.mp4" controls>
+  <track src="basic.vtt" kind="subtitles" default>
+</video>
+</div>
+<script type="text/javascript">
+/**
+ * This test is used to ensure that we don't go into an infinite processing loop
+ * during playing subtitle when setting those CSS properties on video.
+ */
+SimpleTest.waitForExplicitFinish();
+
+let video = document.getElementById("v");
+// We don't need to play whole video, in order to reduce test time, we can start
+// from the half, which can also reproduce the issue.
+video.currentTime = 3.0;
+video.play();
+video.onended = () => {
+  ok(true, "video ends without entering an infinite processing loop");
+  SimpleTest.finish();
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_overlapping_time.html b/dom/media/webvtt/test/mochitest/test_webvtt_overlapping_time.html
new file mode 100644
index 0000000000..5ce08ae77a
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_overlapping_time.html
@@ -0,0 +1,100 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebVTT : cues with overlapping time should be displayed correctly </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<video id ="v" src="gizmo.mp4" controls>
+<script class="testbody" type="text/javascript">
+/**
+ * This test is used to ensure that when cues with overlapping times, the one
+ * with earlier end timestamp should disappear when the media time reaches its
+ * end time. In this test, we have two cues with overlapping time, when the video
+ * starts, both cues should be displayed. When the time passes 1 seconds, the
+ * first cue should disappear and the second cues should be still displayed.
+ */
+var CUES_INFO = [
+  { id: 0, startTime: 0, endTime: 1, text: "This is cue 0."},
+  { id: 1, startTime: 0, endTime: 6, text: "This is cue 1."},
+];
+
+var video = document.getElementById("v");
+
+async function startTest() {
+  const cues = createCues();
+  await startVideo();
+
+  await waitUntilCueIsShowing(cues[0]);
+  await waitUntilCueIsShowing(cues[1]);
+
+  await waitUntilCueIsHiding(cues[0]);
+  await waitUntilCueIsShowing(cues[1]);
+  IsVideoStillPlaying();
+
+  endTestAndClearVideo();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = startTest;
+
+/**
+ * The following are test helper functions.
+ */
+function createCues() {
+  let track = video.addTextTrack("subtitles");
+  track.mode = "showing";
+  let cue0 = new VTTCue(CUES_INFO[0].startTime, CUES_INFO[0].endTime,
+                        CUES_INFO[0].text);
+  cue0.id = CUES_INFO[0].id;
+  let cue1 = new VTTCue(CUES_INFO[1].startTime, CUES_INFO[1].endTime,
+                        CUES_INFO[1].text);
+  cue1.id = CUES_INFO[1].id;
+  track.addCue(cue0);
+  track.addCue(cue1);
+  // Convert them to chrome objects in order to use chrome privilege APIs.
+  cue0 = SpecialPowers.wrap(cue0);
+  cue1 = SpecialPowers.wrap(cue1);
+  return [cue0, cue1];
+}
+
+async function startVideo() {
+  info(`start play video`);
+  const played = video && await video.play().then(() => true, () => false);
+  ok(played, "video has started playing");
+}
+
+async function waitUntilCueIsShowing(cue) {
+  info(`wait until cue ${cue.id} is showing`);
+  // cue has not been showing yet.
+  if (!cue.getActive) {
+    await once(cue, "enter");
+  }
+  info(`video current time=${video.currentTime}`);
+  ok(cue.getActive, `cue ${cue.id} is showing`);
+}
+
+async function waitUntilCueIsHiding(cue) {
+  info(`wait until cue ${cue.id} is hiding`);
+  // cue has not been hidden yet.
+  if (cue.getActive) {
+    await once(cue, "exit");
+  }
+  info(`video current time=${video.currentTime}`);
+  ok(!cue.getActive, `cue ${cue.id} is hidding`);
+}
+
+function IsVideoStillPlaying() {
+  ok(!video.paused, `video is still playing, currentTime=${video.currentTime}`);
+}
+
+function endTestAndClearVideo() {
+  removeNodeAndSource(video);
+  SimpleTest.finish();
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_positionalign.html b/dom/media/webvtt/test/mochitest/test_webvtt_positionalign.html
new file mode 100644
index 0000000000..267fd52f93
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_positionalign.html
@@ -0,0 +1,113 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset='utf-8'>
+  <title>WebVTT : position align test</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div id="content">
+</div>
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+var trackElement = document.createElement("track");
+var cuesNumber = 22;
+
+function isTrackElemenLoaded() {
+  // Re-que isTrackElemenLoaded() at the end of the event loop until the track
+  // element has loaded its data.
+  if (trackElement.readyState == 1) {
+    setTimeout(isTrackElemenLoaded, 0);
+    return;
+  }
+
+  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
+  runTest();
+}
+
+function runTest() {
+  info("--- check cues number ---");
+  var cues = trackElement.track.cues;
+  is(cues.length, cuesNumber, "Cues number is correct.");
+
+  info("--- check the typedef of TextTrackCue and VTTCue ---");
+  isnot(window.TextTrackCue, undefined, "TextTrackCue should be defined.");
+  isnot(window.VTTCue, undefined, "VTTCue should be defined.");
+
+  info("--- check the type of first parsed cue ---");
+  ok(cues[0] instanceof TextTrackCue, "Cue should be an instanceof TextTrackCue.");
+  ok(cues[0] instanceof VTTCue, "Cue should be an instanceof VTTCue.");
+
+  info("--- check the cue's position alignment ---");
+  let expectedAlignment = ["auto", "line-left", "center", "line-right", "auto"];
+  let idx = 0;
+  for (;idx < expectedAlignment.length; idx++) {
+    is(cues[idx].positionAlign, expectedAlignment[idx], cues[idx].text);
+  }
+
+  info("--- check the cue's computed position alignment ---");
+  // The "computedPositionAlign" is the chrome-only attributes, we need to get
+  // the chrome privilege for cues.
+  let cuesChrome = SpecialPowers.wrap(cues);
+  expectedAlignment.push("line-left", "line-right", "center");
+  for (;idx < expectedAlignment.length; idx++) {
+    is(cuesChrome[idx].computedPositionAlign, expectedAlignment[idx],
+       cuesChrome[idx].text);
+  }
+
+  info(`test only setting text alignment with "start"`);
+  expectedAlignment.push("line-left", "line-right", "line-left", "line-right",
+                         "line-left", "line-left", "line-right");
+  for (;idx < expectedAlignment.length; idx++) {
+    is(cuesChrome[idx].computedPositionAlign, expectedAlignment[idx],
+       cuesChrome[idx].text);
+  }
+
+  info(`test only setting text alignment with "end"`);
+  expectedAlignment.push("line-right", "line-left", "line-right", "line-left",
+                         "line-right", "line-right", "line-left");
+  for (;idx < expectedAlignment.length; idx++) {
+    is(cuesChrome[idx].computedPositionAlign, expectedAlignment[idx],
+       cuesChrome[idx].text);
+  }
+  is(idx, cuesNumber, "finished checking all cues");
+
+  info("--- check the cue's computed position alignment from DOM API ---");
+  is(cuesChrome[0].computedPositionAlign, "center", "Cue's computedPositionAlign align is center.");
+
+  cuesChrome[0].positionAlign = "auto";
+  is(cuesChrome[0].positionAlign, "auto", "Change cue's position align to \"auto\"");
+
+  cuesChrome[0].align = "left";
+  is(cuesChrome[0].align, "left", "Change cue's align to \"left\".");
+
+  is(cuesChrome[0].computedPositionAlign, "line-left",  "Cue's computedPositionAlign becomes to \"line-left\"");
+
+  info("--- finish test ---");
+  SimpleTest.finish();
+}
+
+function setupTest() {
+  info("--- setup test ---");
+  video.src = "seek.webm";
+  video.preload = "auto";
+
+  trackElement.src = "vttPositionAlign.vtt";
+  trackElement.kind = "subtitles";
+  trackElement.default = true;
+
+  document.getElementById("content").appendChild(video);
+  video.appendChild(trackElement);
+  video.addEventListener("loadedmetadata", function() {
+    isTrackElemenLoaded();
+  }, {once: true});
+}
+
+onload = setupTest;
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_seeking.html b/dom/media/webvtt/test/mochitest/test_webvtt_seeking.html
new file mode 100644
index 0000000000..1f85969743
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_seeking.html
@@ -0,0 +1,110 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebVTT : cue should be displayed properly after seeking</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+/**
+ * This test is used to ensure that the cue should be showed or hid correctly
+ * after seeking. In this test, we have two cues which are not overlapped, so
+ * there should only have one cue showing at a time.
+ */
+var CUES_INFO = [
+  { id: 0, startTime: 1, endTime: 3, text: "This is cue 0."},
+  { id: 1, startTime: 4, endTime: 6, text: "This is cue 1."},
+];
+
+async function startTest() {
+  const video = createVideo();
+  const cues = createCues(video);
+  await startVideo(video);
+
+  await seekVideo(video, cues[0].startTime);
+  await waitUntilCueIsShowing(cues[0]);
+  checkActiveCueAndInactiveCue(cues[0], cues[1]);
+
+  await seekVideo(video, cues[1].startTime);
+  await waitUntilCueIsShowing(cues[1]);
+  checkActiveCueAndInactiveCue(cues[1], cues[0]);
+
+  // seek forward again
+  await seekVideo(video, cues[0].startTime);
+  await waitUntilCueIsShowing(cues[0]);
+  checkActiveCueAndInactiveCue(cues[0], cues[1]);
+
+  removeNodeAndSource(video);
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = startTest;
+/**
+ * The following are test helper functions.
+ */
+function checkActiveCueAndInactiveCue(activeCue, inactiveCue) {
+  ok(activeCue.getActive,
+     `cue ${activeCue.id} [${activeCue.startTime}:${activeCue.endTime}] is active`);
+  ok(!inactiveCue.getActive,
+     `cue ${inactiveCue.id} [${inactiveCue.startTime}:${inactiveCue.endTime}] is inactive`);
+}
+
+function createVideo() {
+  let video = document.createElement("video");
+  video.src = "gizmo.mp4";
+  video.controls = true;
+  document.body.appendChild(video);
+  return video;
+}
+
+function createCues(video) {
+  let track = video.addTextTrack("subtitles");
+  track.mode = "showing";
+  let cue0 = new VTTCue(CUES_INFO[0].startTime, CUES_INFO[0].endTime,
+                        CUES_INFO[0].text);
+  cue0.id = CUES_INFO[0].id;
+  let cue1 = new VTTCue(CUES_INFO[1].startTime, CUES_INFO[1].endTime,
+                        CUES_INFO[1].text);
+  cue1.id = CUES_INFO[1].id;
+  track.addCue(cue0);
+  track.addCue(cue1);
+  // Convert them to chrome objects in order to use chrome privilege APIs.
+  cue0 = SpecialPowers.wrap(cue0);
+  cue1 = SpecialPowers.wrap(cue1);
+  return [cue0, cue1];
+}
+
+async function startVideo(video) {
+  info(`start play video`);
+  const played = video && await video.play().then(() => true, () => false);
+  ok(played, "video has started playing");
+}
+
+async function waitUntilCueIsShowing(cue) {
+  info(`wait until cue ${cue.id} shows`);
+  // cue has not been showing yet.
+  if (!cue.getActive) {
+    await once(cue, "enter");
+  }
+  info(`cue ${cue.id} is showing`);
+}
+
+async function seekVideo(video, time) {
+  ok(isInRange(time, CUES_INFO[0].startTime, CUES_INFO[0].endTime) ||
+     isInRange(time, CUES_INFO[1].startTime, CUES_INFO[1].endTime),
+     `seek target time ${time} is within the correct range`)
+  info(`seek video to ${time}`);
+  video.currentTime = time;
+  await once(video, "seeked");
+  info(`seek succeeded, current time=${video.currentTime}`);
+}
+
+function isInRange(value, lowerBound, higherBound) {
+  return lowerBound <= value && value <= higherBound;
+}
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/test_webvtt_update_display_after_adding_or_removing_cue.html b/dom/media/webvtt/test/mochitest/test_webvtt_update_display_after_adding_or_removing_cue.html
new file mode 100644
index 0000000000..7fb8e6761b
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/test_webvtt_update_display_after_adding_or_removing_cue.html
@@ -0,0 +1,93 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebVTT : cue display should be updated immediately after adding or removing cue</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="manifest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+/**
+ * This test is used to ensure that we will update cue display immediately after
+ * adding or removing cue after video starts, because `show-poster` flag would be
+ * reset after video starts, which allows us to process cues instead of showing
+ * a poster. In this test, we start with adding a cue [0:5] to video, which
+ * should be showed in the beginning, and then remove the cue later. The cue
+ * should be removed immediately, not show
+ */
+async function startTest() {
+  const video = await createVideo();
+  await startVideo(video);
+
+  info(`cue should be showed immediately after it was added.`);
+  const cue = createCueAndAddCueToVideo(video);
+  await waitUntilCueShows(cue);
+
+  info(`cue should be hid immediately after it was removed.`);
+  removeCueFromVideo(cue, video);
+  checkIfCueHides(cue, video);
+
+  endTestAndClearVideo(video);
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = startTest;
+
+/**
+ * The following are test helper functions.
+ */
+async function createVideo() {
+  let video = document.createElement("video");
+  video.src = "gizmo.mp4";
+  video.controls = true;
+  document.body.appendChild(video);
+  // wait until media has loaded any data, because we won't update cue if it has
+  // not got any data.
+  await once(video, "loadedmetadata");
+  return video;
+}
+
+async function startVideo(video) {
+  info(`start play video`);
+  const played = video && await video.play().then(() => true, () => false);
+  ok(played, "video has started playing");
+}
+
+function createCueAndAddCueToVideo(video) {
+  let track = video.addTextTrack("subtitles");
+  track.mode = "showing";
+  let cue = new VTTCue(0, 5, "Test");
+  track.addCue(cue);
+  return cue;
+}
+
+function removeCueFromVideo(cue, video) {
+  let track = video.textTracks[0];
+  track.removeCue(cue);
+}
+
+async function waitUntilCueShows(cue) {
+  info(`wait until cue shows`);
+  // cue has not been showed yet.
+  cue = SpecialPowers.wrap(cue);
+  if (!cue.getActive) {
+    await once(cue, "enter");
+  }
+  ok(cue.getActive, `cue has been showed,`);
+}
+
+function checkIfCueHides(cue, video) {
+  ok(!SpecialPowers.wrap(cue).getActive, `cue has been hidden.`);
+  ok(video.currentTime < cue.endTime,
+    `cue is removed at ${video.currentTime}s before reaching its endtime.`);
+}
+
+function endTestAndClearVideo(video) {
+  removeNodeAndSource(video);
+  SimpleTest.finish();
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/mochitest/vttPositionAlign.vtt b/dom/media/webvtt/test/mochitest/vttPositionAlign.vtt
new file mode 100644
index 0000000000..7613f4e7c5
--- /dev/null
+++ b/dom/media/webvtt/test/mochitest/vttPositionAlign.vtt
@@ -0,0 +1,86 @@
+WEBVTT
+
+00:00.000 --> 00:00.500
+Cue 0 : PositionAlign should be "auto".
+
+00:00.700 --> 00:00.800 position:50%,line-left
+Cue 1 : PositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 position:50%,center
+Cue 2 : PositionAlign should be "center".
+
+00:00.700 --> 00:00.800 position:50%,line-right
+Cue 3 : PositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 position:50%,auto
+Cue 4 : PositionAlign should be "auto"
+
+00:00.700 --> 00:00.800 position:50%,auto align:left
+Cue 5 : PositionAlign should be "auto", but computedPositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 position:50%,auto align:right
+Cue 6 : PositionAlign should be "auto", but computedPositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 position:50%,auto align:middle
+Cue 7 : PositionAlign should be "auto", but computedPositionAlign should be "center".
+
+NOTE ### These following cues are set with `align:start` ###
+
+00:00.700 --> 00:00.800 align:start
+LTR character in the beginning and align is "start", so computedPositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 align:start
+שלום RTL character in the beginning and align is "start", so computedPositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 align:start
+@ neutral charater in the beginning, but the first strong charater is LTR in "align:start". So computedPositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 align:start
+@ש neutral charater in the beginning, but the first strong charater is RTL in "align:start". So computedPositionAlign should be "line-right".
+
+NOTE
+This line contains only neutral charater, we would treat its base direction as
+LTR. However, if there are other following lines contains non-neutral
+charaters, we would detemine the base direction by the following line.
+
+00:00.700 --> 00:00.800 align:start
+@
+
+00:00.700 --> 00:00.800 align:start
+@
+The second line starts with LTR charater, computedPositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 align:start
+@
+שThe second line starts with RTL charater, computedPositionAlign should be "line-right".
+
+NOTE ### These following cues are set with `align:end` ###
+
+00:00.700 --> 00:00.800 align:end
+LTR character in the beginning and align is "end", so computedPositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 align:end
+ש RTL character in the beginning and align is "end", so computedPositionAlign should be "line-left".
+
+00:00.700 --> 00:00.800 align:end
+@ neutral charater in the beginning, but the first strong charater is LTR in "align:end". So computedPositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 align:end
+@ש neutral charater in the beginning, but the first strong charater is RTL in "align:end". So computedPositionAlign should be "line-left".
+
+NOTE
+This line contains only neutral charater, we would treat its base direction as
+LTR. However, if there are other following lines contains non-neutral
+charaters, we would detemine the base direction by the following line.
+
+00:00.700 --> 00:00.800 align:end
+@
+
+00:00.700 --> 00:00.800 align:end
+@
+The second line starts with LTR charater, computedPositionAlign should be "line-right".
+
+00:00.700 --> 00:00.800 align:end
+@
+שThe second line starts with RTL charater, computedPositionAlign should be "line-left".
+
diff --git a/dom/media/webvtt/test/reftest/black.mp4 b/dom/media/webvtt/test/reftest/black.mp4
new file mode 100644
index 0000000000..24eb3be139
Binary files /dev/null and b/dom/media/webvtt/test/reftest/black.mp4 differ
diff --git a/dom/media/webvtt/test/reftest/cues_time_overlapping.webvtt b/dom/media/webvtt/test/reftest/cues_time_overlapping.webvtt
new file mode 100644
index 0000000000..8ed899a9d8
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/cues_time_overlapping.webvtt
@@ -0,0 +1,7 @@
+WEBVTT FILE
+
+00:00:00.000 --> 00:00:01.000
+First cue
+
+00:00:00.000 --> 00:00:04.000
+Second cue
diff --git a/dom/media/webvtt/test/reftest/reftest.list b/dom/media/webvtt/test/reftest/reftest.list
new file mode 100644
index 0000000000..8311bac10f
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/reftest.list
@@ -0,0 +1,3 @@
+skip-if(Android) fuzzy-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu)&&/^aarch64-msvc/.test(xulRuntime.XPCOMABI),0-136,0-427680) == vtt_update_display_after_removed_cue.html vtt_update_display_after_removed_cue_ref.html
+skip-if(Android) fuzzy-if(winWidget,0-170,0-170) == vtt_overlapping_time.html vtt_overlapping_time-ref.html
+skip-if(Android) != vtt_reflow_display.html vtt_reflow_display-ref.html
diff --git a/dom/media/webvtt/test/reftest/vtt_overlapping_time-ref.html b/dom/media/webvtt/test/reftest/vtt_overlapping_time-ref.html
new file mode 100644
index 0000000000..a44e24678b
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_overlapping_time-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+</head>
+<body>
+<video id="v1" src="black.mp4" width="320" height="180">
+  <track label="English" src="cues_time_overlapping.webvtt" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is to ensure that when cues with overlapping times, the one with
+ * earlier end timestamp should disappear when the media time reaches its
+ * end time. This vtt file contains two cues, the first cue is [0,1], the second
+ * cue is [0,4], so if we seek video to 2s, only cue2 should be displayed.
+ */
+async function testTimeOverlappingCues() {
+  const video = document.getElementById("v1");
+  video.currentTime = 2;
+  video.onseeked = () => {
+    video.onseeked = null;
+    document.documentElement.removeAttribute('class');
+  }
+};
+
+window.addEventListener("MozReftestInvalidate",
+                        testTimeOverlappingCues);
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/vtt_overlapping_time.html b/dom/media/webvtt/test/reftest/vtt_overlapping_time.html
new file mode 100644
index 0000000000..f973b398d5
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_overlapping_time.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+</head>
+<body>
+<video id="v1" src="black.mp4" autoplay width="320" height="180">
+  <track label="English" src="cues_time_overlapping.webvtt" default>
+</video>
+<script type="text/javascript">
+/**
+ * This test is to ensure that when cues with overlapping times, the one with
+ * earlier end timestamp should disappear when the media time reaches its
+ * end time. This vtt file contains two cues, the first cue is [0,1], the second
+ * cue is [0,4], so after video is playing over 1s, only cue2 should be displayed.
+ */
+async function testTimeOverlappingCues() {
+  const video = document.getElementById("v1");
+  video.ontimeupdate = () => {
+    if (video.currentTime > 1.0) {
+      document.documentElement.removeAttribute('class');
+      video.ontimeupdate = null;
+    }
+  }
+};
+
+window.addEventListener("MozReftestInvalidate",
+                        testTimeOverlappingCues);
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html b/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html
new file mode 100644
index 0000000000..19f3208e6b
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<html>
+<link rel="stylesheet" href="vtt_reflow_display.css">
+<body>
+<div class="video-player">
+  <div class="video-layer">
+    <video id="v1" autoplay controls></video>
+  </div>
+</div>
+<script>
+/**
+ * Simply play and pause a video without any cues.
+ */
+async function testDisplayCueDuringFrequentReflowRef() {
+  const video = document.getElementById("v1");
+  video.src = "white.webm";
+  video.onplay = _ => {
+    video.onplay = null;
+    video.pause();
+    document.documentElement.removeAttribute('class');
+  }
+};
+
+window.addEventListener("MozReftestInvalidate",
+                        testDisplayCueDuringFrequentReflowRef);
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/vtt_reflow_display.css b/dom/media/webvtt/test/reftest/vtt_reflow_display.css
new file mode 100644
index 0000000000..4b66a07bd4
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_reflow_display.css
@@ -0,0 +1,33 @@
+body {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  max-height: 100%;
+  width: 100vw;
+  height: 100vh;
+}
+.video-player {
+  display: flex;
+  max-height: calc(100% - 400px);
+  flex: 1 1 0;
+  flex-direction: column;
+  position: relative;
+  max-width: 100%;
+  height: 0;
+}
+.video-layer {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  width: 100%;
+  height: 100%;
+  flex: 1 1 0;
+}
+video {
+  object-fit: contain;
+  display: flex;
+  flex: auto;
+  max-width: 100%;
+  min-height: 0;
+  min-width: 0;
+}
diff --git a/dom/media/webvtt/test/reftest/vtt_reflow_display.html b/dom/media/webvtt/test/reftest/vtt_reflow_display.html
new file mode 100644
index 0000000000..e7ec496bc1
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_reflow_display.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+</head>
+<link rel="stylesheet" href="vtt_reflow_display.css">
+<body>
+<div class="video-player">
+  <div class="video-layer">
+    <video id="v1" autoplay controls></video>
+  </div>
+</div>
+<script>
+/**
+ * In bug 1733232, setting some CSS properties (from bug 1733232 comment17)
+ * would cause video frame's reflow called very frequently, which crashed the
+ * video control and caused no cue showing. We compare this test with another
+ * white video without any cues, and they should NOT be equal.
+ */
+function testDisplayCueDuringFrequentReflow() {
+  let video = document.getElementById("v1");
+  video.src = "white.webm";
+  let cue = new VTTCue(0, 4, "hello testing");
+  cue.onenter = _ => {
+    cue.onenter = null;
+    video.pause();
+    document.documentElement.removeAttribute('class');
+  }
+  let track = video.addTextTrack("captions");
+  track.mode = "showing";
+  track.addCue(cue);
+};
+
+window.addEventListener("MozReftestInvalidate",
+                        testDisplayCueDuringFrequentReflow);
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue.html b/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue.html
new file mode 100644
index 0000000000..4cd5d5bbd2
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+</head>
+<body>
+<video id="v1" autoplay></video>
+<script type="text/javascript">
+
+/**
+ * This test is used to ensure we would update the cue display after removing
+ * cue from the text track, the removed cue should not display on the video's
+ * rendering area.
+ */
+function testUpdateDisplayAfterRemovedCue() {
+  let video = document.getElementById("v1");
+  video.src = "black.mp4";
+  let cue = new VTTCue(0, 4, "hello testing");
+  let track = video.addTextTrack("captions");
+  track.mode = "showing";
+  track.addCue(cue);
+  cue.onenter = () => {
+    cue.onenter = null;
+    track.removeCue(cue);
+    video.pause();
+    video.onpause = () => {
+      video.onpause = null;
+      document.documentElement.removeAttribute('class');
+    }
+  }
+};
+
+window.addEventListener("MozReftestInvalidate",
+                        testUpdateDisplayAfterRemovedCue);
+</script>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue_ref.html b/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue_ref.html
new file mode 100644
index 0000000000..0b1afdc568
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_update_display_after_removed_cue_ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE HTML>
+<html>
+<body>
+<video id="v1" src="black.mp4"></video>
+</body>
+</html>
diff --git a/dom/media/webvtt/test/reftest/white.webm b/dom/media/webvtt/test/reftest/white.webm
new file mode 100644
index 0000000000..bbacad7ffd
Binary files /dev/null and b/dom/media/webvtt/test/reftest/white.webm differ
diff --git a/dom/media/webvtt/test/xpcshell/test_parser.js b/dom/media/webvtt/test/xpcshell/test_parser.js
new file mode 100644
index 0000000000..5ae70f9762
--- /dev/null
+++ b/dom/media/webvtt/test/xpcshell/test_parser.js
@@ -0,0 +1,158 @@
+"use strict";
+
+const { WebVTT } = ChromeUtils.importESModule(
+  "resource://gre/modules/vtt.sys.mjs"
+);
+
+let fakeWindow = {
+  /* eslint-disable object-shorthand */
+  VTTCue: function () {},
+  VTTRegion: function () {},
+  /* eslint-enable object-shorthand */
+};
+
+// We have a better parser check in WPT. Here I want to check that incomplete
+// lines are correctly parsable.
+let tests = [
+  // Signature
+  { input: ["WEBVTT"], cue: 0, region: 0 },
+  { input: ["", "WE", "BVT", "T"], cue: 0, region: 0 },
+  { input: ["WEBVTT - This file has no cues."], cue: 0, region: 0 },
+  { input: ["WEBVTT", " - ", "This file has no cues."], cue: 0, region: 0 },
+
+  // Body with IDs
+  {
+    input: [
+      "WEB",
+      "VTT - This file has cues.\n",
+      "\n",
+      "14\n",
+      "00:01:14",
+      ".815 --> 00:0",
+      "1:18.114\n",
+      "- What?\n",
+      "- Where are we now?\n",
+      "\n",
+      "15\n",
+      "00:01:18.171 --> 00:01:20.991\n",
+      "- T",
+      "his is big bat country.\n",
+      "\n",
+      "16\n",
+      "00:01:21.058 --> 00:01:23.868\n",
+      "- [ Bat",
+      "s Screeching ]\n",
+      "- They won't get in your hair. They're after the bug",
+      "s.\n",
+    ],
+    cue: 3,
+    region: 0,
+  },
+
+  // Body without IDs
+  {
+    input: [
+      "WEBVTT - This file has c",
+      "ues.\n",
+      "\n",
+      "00:01:14.815 --> 00:01:18.114\n",
+      "- What?\n",
+      "- Where are we now?\n",
+      "\n",
+      "00:01:18.171 --> 00:01:2",
+      "0.991\n",
+      "- ",
+      "This is big bat country.\n",
+      "\n",
+      "00:01:21.058 --> 00:01:23.868\n",
+      "- [ Bats S",
+      "creeching ]\n",
+      "- They won't get in your hair. They're after the bugs.\n",
+    ],
+    cue: 3,
+    region: 0,
+  },
+
+  // Note
+  {
+    input: ["WEBVTT - This file has no cues.\n", "\n", "NOTE what"],
+    cue: 0,
+    region: 0,
+  },
+
+  // Regions - This vtt is taken from a WPT
+  {
+    input: [
+      "WE",
+      "BVTT\n",
+      "\n",
+      "REGION\n",
+      "id:0\n",
+      "\n",
+      "REGION\n",
+      "id:1\n",
+      "region",
+      "an",
+      "chor:0%,0%\n",
+      "\n",
+      "R",
+      "EGION\n",
+      "id:2\n",
+      "regionanchor:18446744073709552000%,18446744",
+      "073709552000%\n",
+      "\n",
+      "REGION\n",
+      "id:3\n",
+      "regionanchor: 100%,100%\n",
+      "regio",
+      "nanchor :100%,100%\n",
+      "regionanchor:100% ,100%\n",
+      "regionanchor:100%, 100%\n",
+      "regionanchor:100 %,100%\n",
+      "regionanchor:10",
+      "0%,100 %\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000",
+      " region:0\n",
+      "text\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000 region:1\n",
+      "text\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000 region:3\n",
+      "text\n",
+    ],
+    cue: 3,
+    region: 4,
+  },
+];
+
+function run_test() {
+  tests.forEach(test => {
+    let parser = new WebVTT.Parser(fakeWindow, null);
+    ok(!!parser, "Ok... this is a good starting point");
+
+    let cue = 0;
+    parser.oncue = () => {
+      ++cue;
+    };
+
+    let region = 0;
+    parser.onregion = () => {
+      ++region;
+    };
+
+    parser.onparsingerror = () => {
+      ok(false, "No error accepted");
+    };
+
+    test.input.forEach(input => {
+      parser.parse(new TextEncoder().encode(input));
+    });
+
+    parser.flush();
+
+    equal(cue, test.cue, "Cue value matches");
+    equal(region, test.region, "Region value matches");
+  });
+}
diff --git a/dom/media/webvtt/test/xpcshell/xpcshell.ini b/dom/media/webvtt/test/xpcshell/xpcshell.ini
new file mode 100644
index 0000000000..07aa5d80d8
--- /dev/null
+++ b/dom/media/webvtt/test/xpcshell/xpcshell.ini
@@ -0,0 +1,3 @@
+[DEFAULT]
+
+[test_parser.js]
-- 
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