From 43a97878ce14b72f0981164f87f2e35e14151312 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 11:22:09 +0200
Subject: Adding upstream version 110.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/media/mediasource/test/.eslintrc.js            |  28 +++
 dom/media/mediasource/test/1516754.webm            | Bin 0 -> 1081344 bytes
 dom/media/mediasource/test/1516754.webm^headers^   |   1 +
 dom/media/mediasource/test/aac20-48000-64000-1.m4s | Bin 0 -> 24328 bytes
 .../test/aac20-48000-64000-1.m4s^headers^          |   1 +
 dom/media/mediasource/test/aac20-48000-64000-2.m4s | Bin 0 -> 24132 bytes
 .../test/aac20-48000-64000-2.m4s^headers^          |   1 +
 .../mediasource/test/aac20-48000-64000-init.mp4    | Bin 0 -> 1246 bytes
 .../test/aac20-48000-64000-init.mp4^headers^       |   1 +
 .../mediasource/test/aac51-48000-128000-1.m4s      | Bin 0 -> 48979 bytes
 .../test/aac51-48000-128000-1.m4s^headers^         |   1 +
 .../mediasource/test/aac51-48000-128000-2.m4s      | Bin 0 -> 47727 bytes
 .../test/aac51-48000-128000-2.m4s^headers^         |   1 +
 .../mediasource/test/aac51-48000-128000-init.mp4   | Bin 0 -> 634 bytes
 .../test/aac51-48000-128000-init.mp4^headers^      |   1 +
 dom/media/mediasource/test/avc3/init.mp4           | Bin 0 -> 687 bytes
 dom/media/mediasource/test/avc3/init.mp4^headers^  |   1 +
 dom/media/mediasource/test/avc3/segment1.m4s       | Bin 0 -> 696869 bytes
 .../mediasource/test/avc3/segment1.m4s^headers^    |   1 +
 dom/media/mediasource/test/bipbop/bipbop1.m4s      | Bin 0 -> 24424 bytes
 .../mediasource/test/bipbop/bipbop1.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop10.m4s     | Bin 0 -> 18279 bytes
 .../mediasource/test/bipbop/bipbop10.m4s^headers^  |   1 +
 dom/media/mediasource/test/bipbop/bipbop11.m4s     | Bin 0 -> 24607 bytes
 .../mediasource/test/bipbop/bipbop11.m4s^headers^  |   1 +
 dom/media/mediasource/test/bipbop/bipbop12.m4s     | Bin 0 -> 22676 bytes
 .../mediasource/test/bipbop/bipbop12.m4s^headers^  |   1 +
 dom/media/mediasource/test/bipbop/bipbop13.m4s     | Bin 0 -> 9847 bytes
 .../mediasource/test/bipbop/bipbop13.m4s^headers^  |   1 +
 dom/media/mediasource/test/bipbop/bipbop2.m4s      | Bin 0 -> 22205 bytes
 .../mediasource/test/bipbop/bipbop2.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop2s.mp4     | Bin 0 -> 48024 bytes
 .../mediasource/test/bipbop/bipbop2s.mp4^headers^  |   1 +
 dom/media/mediasource/test/bipbop/bipbop3.m4s      | Bin 0 -> 24013 bytes
 .../mediasource/test/bipbop/bipbop3.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop4.m4s      | Bin 0 -> 23112 bytes
 .../mediasource/test/bipbop/bipbop4.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop5.m4s      | Bin 0 -> 18367 bytes
 .../mediasource/test/bipbop/bipbop5.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop6.m4s      | Bin 0 -> 24455 bytes
 .../mediasource/test/bipbop/bipbop6.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop7.m4s      | Bin 0 -> 22442 bytes
 .../mediasource/test/bipbop/bipbop7.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop8.m4s      | Bin 0 -> 24356 bytes
 .../mediasource/test/bipbop/bipbop8.m4s^headers^   |   1 +
 dom/media/mediasource/test/bipbop/bipbop9.m4s      | Bin 0 -> 23252 bytes
 .../mediasource/test/bipbop/bipbop9.m4s^headers^   |   1 +
 .../mediasource/test/bipbop/bipbop_300-3s.webm     | Bin 0 -> 79429 bytes
 .../test/bipbop/bipbop_300-3s.webm^headers^        |   1 +
 .../test/bipbop/bipbop_480_624kbps-video1.m4s      | Bin 0 -> 66806 bytes
 .../bipbop/bipbop_480_624kbps-video1.m4s^headers^  |   1 +
 .../test/bipbop/bipbop_480_624kbps-video2.m4s      | Bin 0 -> 65292 bytes
 .../bipbop/bipbop_480_624kbps-video2.m4s^headers^  |   1 +
 .../test/bipbop/bipbop_480_624kbps-videoinit.mp4   | Bin 0 -> 1410 bytes
 .../bipbop_480_624kbps-videoinit.mp4^headers^      |   1 +
 .../mediasource/test/bipbop/bipbop_audio1.m4s      | Bin 0 -> 694 bytes
 .../test/bipbop/bipbop_audio1.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio10.m4s     | Bin 0 -> 879 bytes
 .../test/bipbop/bipbop_audio10.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_audio11.m4s     | Bin 0 -> 208 bytes
 .../test/bipbop/bipbop_audio11.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_audio2.m4s      | Bin 0 -> 750 bytes
 .../test/bipbop/bipbop_audio2.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio3.m4s      | Bin 0 -> 724 bytes
 .../test/bipbop/bipbop_audio3.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio4.m4s      | Bin 0 -> 806 bytes
 .../test/bipbop/bipbop_audio4.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio5.m4s      | Bin 0 -> 822 bytes
 .../test/bipbop/bipbop_audio5.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio6.m4s      | Bin 0 -> 833 bytes
 .../test/bipbop/bipbop_audio6.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio7.m4s      | Bin 0 -> 888 bytes
 .../test/bipbop/bipbop_audio7.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio8.m4s      | Bin 0 -> 829 bytes
 .../test/bipbop/bipbop_audio8.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audio9.m4s      | Bin 0 -> 778 bytes
 .../test/bipbop/bipbop_audio9.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_audioinit.mp4   | Bin 0 -> 825 bytes
 .../test/bipbop/bipbop_audioinit.mp4^headers^      |   1 +
 dom/media/mediasource/test/bipbop/bipbop_dash.mpd  |  48 +++++
 .../test/bipbop/bipbop_offset_0.0-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.0-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.0-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.0-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.0-init.mp4         | Bin 0 -> 1441 bytes
 .../bipbop/bipbop_offset_0.0-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.1-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.1-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.1-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.1-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.1-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.1-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.2-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.2-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.2-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.2-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.2-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.2-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.3-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.3-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.3-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.3-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.3-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.3-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.4-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.4-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.4-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.4-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.4-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.4-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.5-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.5-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.5-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.5-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.5-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.5-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.6-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.6-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.6-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.6-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.6-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.6-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.7-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.7-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.7-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.7-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.7-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.7-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.8-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.8-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.8-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.8-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.8-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.8-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_0.9-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_0.9-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.9-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_0.9-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_0.9-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_0.9-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_1.0-1.m4s            | Bin 0 -> 110108 bytes
 .../test/bipbop/bipbop_offset_1.0-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_1.0-2.m4s            | Bin 0 -> 116079 bytes
 .../test/bipbop/bipbop_offset_1.0-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_1.0-init.mp4         | Bin 0 -> 1453 bytes
 .../bipbop/bipbop_offset_1.0-init.mp4^headers^     |   1 +
 .../test/bipbop/bipbop_offset_1.1-1.m4s            | Bin 0 -> 143079 bytes
 .../test/bipbop/bipbop_offset_1.1-1.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_1.1-2.m4s            | Bin 0 -> 137858 bytes
 .../test/bipbop/bipbop_offset_1.1-2.m4s^headers^   |   1 +
 .../test/bipbop/bipbop_offset_1.1-init.mp4         | Bin 0 -> 1336 bytes
 .../bipbop/bipbop_offset_1.1-init.mp4^headers^     |   1 +
 .../bipbop/bipbop_trailing_skip_box_video1.m4s     | Bin 0 -> 1023860 bytes
 .../bipbop_trailing_skip_box_video1.m4s^headers^   |   1 +
 .../mediasource/test/bipbop/bipbop_video1.m4s      | Bin 0 -> 23860 bytes
 .../test/bipbop/bipbop_video1.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video10.m4s     | Bin 0 -> 18109 bytes
 .../test/bipbop/bipbop_video10.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_video11.m4s     | Bin 0 -> 23969 bytes
 .../test/bipbop/bipbop_video11.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_video12.m4s     | Bin 0 -> 21937 bytes
 .../test/bipbop/bipbop_video12.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_video13.m4s     | Bin 0 -> 16265 bytes
 .../test/bipbop/bipbop_video13.m4s^headers^        |   1 +
 .../mediasource/test/bipbop/bipbop_video2.m4s      | Bin 0 -> 21595 bytes
 .../test/bipbop/bipbop_video2.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video3.m4s      | Bin 0 -> 23429 bytes
 .../test/bipbop/bipbop_video3.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video4.m4s      | Bin 0 -> 22446 bytes
 .../test/bipbop/bipbop_video4.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video5.m4s      | Bin 0 -> 18191 bytes
 .../test/bipbop/bipbop_video5.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video6.m4s      | Bin 0 -> 23773 bytes
 .../test/bipbop/bipbop_video6.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video7.m4s      | Bin 0 -> 21749 bytes
 .../test/bipbop/bipbop_video7.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video8.m4s      | Bin 0 -> 23608 bytes
 .../test/bipbop/bipbop_video8.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_video9.m4s      | Bin 0 -> 22553 bytes
 .../test/bipbop/bipbop_video9.m4s^headers^         |   1 +
 .../mediasource/test/bipbop/bipbop_videoinit.mp4   | Bin 0 -> 887 bytes
 .../test/bipbop/bipbop_videoinit.mp4^headers^      |   1 +
 dom/media/mediasource/test/bipbop/bipbopinit.mp4   | Bin 0 -> 1395 bytes
 .../test/bipbop/bipbopinit.mp4^headers^            |   1 +
 dom/media/mediasource/test/bug1718709_high_res.mp4 | Bin 0 -> 1038283 bytes
 dom/media/mediasource/test/bug1718709_low_res.mp4  | Bin 0 -> 245318 bytes
 dom/media/mediasource/test/crashtests/1005366.html |  27 +++
 dom/media/mediasource/test/crashtests/1059035.html |  26 +++
 dom/media/mediasource/test/crashtests/926665.html  |  26 +++
 dom/media/mediasource/test/crashtests/931388.html  |  17 ++
 .../mediasource/test/crashtests/crashtests.list    |   4 +
 dom/media/mediasource/test/flac/00001.m4s          | Bin 0 -> 658125 bytes
 dom/media/mediasource/test/flac/00001.m4s^headers^ |   1 +
 dom/media/mediasource/test/flac/00002.m4s          | Bin 0 -> 685567 bytes
 dom/media/mediasource/test/flac/00002.m4s^headers^ |   1 +
 dom/media/mediasource/test/flac/00003.m4s          | Bin 0 -> 747868 bytes
 dom/media/mediasource/test/flac/00003.m4s^headers^ |   1 +
 dom/media/mediasource/test/flac/IS.mp4             | Bin 0 -> 608 bytes
 dom/media/mediasource/test/flac/IS.mp4^headers^    |   1 +
 dom/media/mediasource/test/init-trackid2.mp4       | Bin 0 -> 9108 bytes
 .../mediasource/test/init-trackid2.mp4^headers^    |   1 +
 dom/media/mediasource/test/init-trackid3.mp4       | Bin 0 -> 9108 bytes
 .../mediasource/test/init-trackid3.mp4^headers^    |   1 +
 dom/media/mediasource/test/mediasource.js          | 233 +++++++++++++++++++++
 dom/media/mediasource/test/mochitest.ini           | 211 +++++++++++++++++++
 dom/media/mediasource/test/seek.webm               | Bin 0 -> 215529 bytes
 dom/media/mediasource/test/seek.webm^headers^      |   1 +
 dom/media/mediasource/test/seek_lowres.webm        | Bin 0 -> 100749 bytes
 .../mediasource/test/seek_lowres.webm^headers^     |   1 +
 dom/media/mediasource/test/segment-2.0001.m4s      | Bin 0 -> 34778 bytes
 .../mediasource/test/segment-2.0001.m4s^headers^   |   1 +
 dom/media/mediasource/test/segment-2.0002.m4s      | Bin 0 -> 34653 bytes
 .../mediasource/test/segment-2.0002.m4s^headers^   |   1 +
 dom/media/mediasource/test/segment-3.0001.m4s      | Bin 0 -> 34787 bytes
 .../mediasource/test/segment-3.0001.m4s^headers^   |   1 +
 dom/media/mediasource/test/segment-3.0002.m4s      | Bin 0 -> 34640 bytes
 .../mediasource/test/segment-3.0002.m4s^headers^   |   1 +
 .../mediasource/test/tags_before_cluster.webm      | Bin 0 -> 111714 bytes
 .../test/tags_before_cluster.webm^header^          |   1 +
 dom/media/mediasource/test/test_AVC3_mp4.html      |  38 ++++
 .../test/test_AbortAfterPartialMediaSegment.html   |  62 ++++++
 .../test/test_AppendPartialInitSegment.html        |  43 ++++
 .../mediasource/test/test_AudioChange_mp4.html     |  49 +++++
 .../test/test_AudioChange_mp4_WebAudio.html        |  55 +++++
 .../mediasource/test/test_AutoRevocation.html      |  40 ++++
 dom/media/mediasource/test/test_BufferedSeek.html  |  44 ++++
 .../mediasource/test/test_BufferedSeek_mp4.html    |  43 ++++
 dom/media/mediasource/test/test_BufferingWait.html |  52 +++++
 .../mediasource/test/test_BufferingWait_mp4.html   |  49 +++++
 dom/media/mediasource/test/test_ChangeType.html    |  84 ++++++++
 .../test_ChangeWhileWaitingOnMissingData_mp4.html  |  37 ++++
 .../test/test_DifferentStreamStartTimes.html       |  54 +++++
 .../test/test_DrainOnMissingData_mp4.html          |  49 +++++
 .../mediasource/test/test_DurationChange.html      |  71 +++++++
 .../mediasource/test/test_DurationUpdated.html     |  48 +++++
 .../mediasource/test/test_DurationUpdated_mp4.html |  47 +++++
 dom/media/mediasource/test/test_EndOfStream.html   |  29 +++
 .../mediasource/test/test_EndOfStream_mp4.html     |  29 +++
 dom/media/mediasource/test/test_EndedEvent.html    |  31 +++
 dom/media/mediasource/test/test_Eviction_mp4.html  |  63 ++++++
 .../mediasource/test/test_ExperimentalAsync.html   | 102 +++++++++
 .../mediasource/test/test_FrameSelection.html      |  64 ++++++
 .../mediasource/test/test_FrameSelection_mp4.html  |  49 +++++
 .../mediasource/test/test_HEAAC_extradata.html     |  89 ++++++++
 .../test/test_HaveMetadataUnbufferedSeek.html      |  38 ++++
 .../test/test_HaveMetadataUnbufferedSeek_mp4.html  |  42 ++++
 .../test/test_InputBufferIsCleared.html            |  58 +++++
 dom/media/mediasource/test/test_LiveSeekable.html  |  76 +++++++
 .../mediasource/test/test_LoadedDataFired_mp4.html |  57 +++++
 .../mediasource/test/test_LoadedMetadataFired.html |  31 +++
 .../test/test_LoadedMetadataFired_mp4.html         |  31 +++
 dom/media/mediasource/test/test_MediaSource.html   |  92 ++++++++
 .../test/test_MediaSource_capture_gc.html          |  72 +++++++
 .../test/test_MediaSource_disabled.html            |  31 +++
 .../test/test_MediaSource_flac_mp4.html            |  33 +++
 .../test/test_MediaSource_memory_reporting.html    |  47 +++++
 .../mediasource/test/test_MediaSource_mp4.html     |  90 ++++++++
 .../test/test_MultipleInitSegments.html            |  49 +++++
 .../test/test_MultipleInitSegments_mp4.html        |  44 ++++
 dom/media/mediasource/test/test_OnEvents.html      |  42 ++++
 dom/media/mediasource/test/test_PlayEvents.html    | 115 ++++++++++
 .../test/test_PlayEventsAutoPlaying.html           |  58 +++++
 .../test/test_PlayEventsAutoPlaying2.html          |  58 +++++
 .../mediasource/test/test_RemoveSourceBuffer.html  |  52 +++++
 ...ution_change_should_not_cause_video_freeze.html |  49 +++++
 .../test/test_ResumeAfterClearing_mp4.html         |  44 ++++
 .../mediasource/test/test_SeekNoData_mp4.html      |  57 +++++
 dom/media/mediasource/test/test_SeekToEnd_mp4.html |  54 +++++
 .../mediasource/test/test_SeekToLastFrame_mp4.html |  34 +++
 dom/media/mediasource/test/test_SeekTwice_mp4.html |  45 ++++
 .../test_SeekableBeforeAndAfterEndOfStream.html    |  54 +++++
 ...est_SeekableBeforeAndAfterEndOfStreamSplit.html |  60 ++++++
 ...SeekableBeforeAndAfterEndOfStreamSplit_mp4.html |  60 ++++++
 ...test_SeekableBeforeAndAfterEndOfStream_mp4.html |  55 +++++
 .../mediasource/test/test_SeekedEvent_mp4.html     |  48 +++++
 dom/media/mediasource/test/test_Sequence_mp4.html  |  37 ++++
 dom/media/mediasource/test/test_SetModeThrows.html |  34 +++
 dom/media/mediasource/test/test_SplitAppend.html   |  36 ++++
 .../mediasource/test/test_SplitAppendDelay.html    |  38 ++++
 .../test/test_SplitAppendDelay_mp4.html            |  39 ++++
 .../mediasource/test/test_SplitAppend_mp4.html     |  38 ++++
 dom/media/mediasource/test/test_Threshold_mp4.html |  73 +++++++
 .../mediasource/test/test_TimestampOffset_mp4.html |  76 +++++++
 .../mediasource/test/test_TruncatedDuration.html   |  55 +++++
 .../test/test_TruncatedDuration_mp4.html           |  59 ++++++
 .../test/test_WMFUnmatchedAudioDataTime.html       |  32 +++
 .../test/test_WaitingOnMissingData.html            |  60 ++++++
 .../test/test_WaitingOnMissingDataEnded_mp4.html   |  47 +++++
 .../test/test_WaitingOnMissingData_mp4.html        |  61 ++++++
 .../test/test_WaitingToEndedTransition_mp4.html    |  52 +++++
 .../test/test_WebMTagsBeforeCluster.html           |  47 +++++
 .../mediasource/test/test_trackidchange_mp4.html   |  32 +++
 .../mediasource/test/whitenoise-he-aac-5s.mp4      | Bin 0 -> 27078 bytes
 .../mediasource/test/wmf_mismatchedaudiotime.mp4   | Bin 0 -> 48906 bytes
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 create mode 100644 dom/media/mediasource/test/test_AVC3_mp4.html
 create mode 100644 dom/media/mediasource/test/test_AbortAfterPartialMediaSegment.html
 create mode 100644 dom/media/mediasource/test/test_AppendPartialInitSegment.html
 create mode 100644 dom/media/mediasource/test/test_AudioChange_mp4.html
 create mode 100644 dom/media/mediasource/test/test_AudioChange_mp4_WebAudio.html
 create mode 100644 dom/media/mediasource/test/test_AutoRevocation.html
 create mode 100644 dom/media/mediasource/test/test_BufferedSeek.html
 create mode 100644 dom/media/mediasource/test/test_BufferedSeek_mp4.html
 create mode 100644 dom/media/mediasource/test/test_BufferingWait.html
 create mode 100644 dom/media/mediasource/test/test_BufferingWait_mp4.html
 create mode 100644 dom/media/mediasource/test/test_ChangeType.html
 create mode 100644 dom/media/mediasource/test/test_ChangeWhileWaitingOnMissingData_mp4.html
 create mode 100644 dom/media/mediasource/test/test_DifferentStreamStartTimes.html
 create mode 100644 dom/media/mediasource/test/test_DrainOnMissingData_mp4.html
 create mode 100644 dom/media/mediasource/test/test_DurationChange.html
 create mode 100644 dom/media/mediasource/test/test_DurationUpdated.html
 create mode 100644 dom/media/mediasource/test/test_DurationUpdated_mp4.html
 create mode 100644 dom/media/mediasource/test/test_EndOfStream.html
 create mode 100644 dom/media/mediasource/test/test_EndOfStream_mp4.html
 create mode 100644 dom/media/mediasource/test/test_EndedEvent.html
 create mode 100644 dom/media/mediasource/test/test_Eviction_mp4.html
 create mode 100644 dom/media/mediasource/test/test_ExperimentalAsync.html
 create mode 100644 dom/media/mediasource/test/test_FrameSelection.html
 create mode 100644 dom/media/mediasource/test/test_FrameSelection_mp4.html
 create mode 100644 dom/media/mediasource/test/test_HEAAC_extradata.html
 create mode 100644 dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html
 create mode 100644 dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html
 create mode 100644 dom/media/mediasource/test/test_InputBufferIsCleared.html
 create mode 100644 dom/media/mediasource/test/test_LiveSeekable.html
 create mode 100644 dom/media/mediasource/test/test_LoadedDataFired_mp4.html
 create mode 100644 dom/media/mediasource/test/test_LoadedMetadataFired.html
 create mode 100644 dom/media/mediasource/test/test_LoadedMetadataFired_mp4.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource_capture_gc.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource_disabled.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource_flac_mp4.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource_memory_reporting.html
 create mode 100644 dom/media/mediasource/test/test_MediaSource_mp4.html
 create mode 100644 dom/media/mediasource/test/test_MultipleInitSegments.html
 create mode 100644 dom/media/mediasource/test/test_MultipleInitSegments_mp4.html
 create mode 100644 dom/media/mediasource/test/test_OnEvents.html
 create mode 100644 dom/media/mediasource/test/test_PlayEvents.html
 create mode 100644 dom/media/mediasource/test/test_PlayEventsAutoPlaying.html
 create mode 100644 dom/media/mediasource/test/test_PlayEventsAutoPlaying2.html
 create mode 100644 dom/media/mediasource/test/test_RemoveSourceBuffer.html
 create mode 100644 dom/media/mediasource/test/test_Resolution_change_should_not_cause_video_freeze.html
 create mode 100644 dom/media/mediasource/test/test_ResumeAfterClearing_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekNoData_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekToEnd_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekToLastFrame_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekTwice_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream.html
 create mode 100644 dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit.html
 create mode 100644 dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SeekedEvent_mp4.html
 create mode 100644 dom/media/mediasource/test/test_Sequence_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SetModeThrows.html
 create mode 100644 dom/media/mediasource/test/test_SplitAppend.html
 create mode 100644 dom/media/mediasource/test/test_SplitAppendDelay.html
 create mode 100644 dom/media/mediasource/test/test_SplitAppendDelay_mp4.html
 create mode 100644 dom/media/mediasource/test/test_SplitAppend_mp4.html
 create mode 100644 dom/media/mediasource/test/test_Threshold_mp4.html
 create mode 100644 dom/media/mediasource/test/test_TimestampOffset_mp4.html
 create mode 100644 dom/media/mediasource/test/test_TruncatedDuration.html
 create mode 100644 dom/media/mediasource/test/test_TruncatedDuration_mp4.html
 create mode 100644 dom/media/mediasource/test/test_WMFUnmatchedAudioDataTime.html
 create mode 100644 dom/media/mediasource/test/test_WaitingOnMissingData.html
 create mode 100644 dom/media/mediasource/test/test_WaitingOnMissingDataEnded_mp4.html
 create mode 100644 dom/media/mediasource/test/test_WaitingOnMissingData_mp4.html
 create mode 100644 dom/media/mediasource/test/test_WaitingToEndedTransition_mp4.html
 create mode 100644 dom/media/mediasource/test/test_WebMTagsBeforeCluster.html
 create mode 100644 dom/media/mediasource/test/test_trackidchange_mp4.html
 create mode 100644 dom/media/mediasource/test/whitenoise-he-aac-5s.mp4
 create mode 100644 dom/media/mediasource/test/wmf_mismatchedaudiotime.mp4

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

diff --git a/dom/media/mediasource/test/.eslintrc.js b/dom/media/mediasource/test/.eslintrc.js
new file mode 100644
index 0000000000..e283e384ba
--- /dev/null
+++ b/dom/media/mediasource/test/.eslintrc.js
@@ -0,0 +1,28 @@
+"use strict";
+
+module.exports = {
+  // Globals from mediasource.js. We use false to indicate they should not
+  // be overwritten in scripts.
+  globals: {
+    addMSEPrefs: false,
+    fetchAndLoad: false,
+    fetchAndLoadAsync: false,
+    fetchWithXHR: false,
+    logEvents: false,
+    loadSegment: false,
+    must_not_reject: false,
+    must_not_throw: false,
+    must_reject: false,
+    must_throw: false,
+    once: false,
+    range: false,
+    runWithMSE: false,
+    wait: false,
+    waitUntilTime: false,
+  },
+  // Use const/let instead of var for tighter scoping, avoiding redeclaration
+  rules: {
+    "no-var": "error",
+    "prefer-const": "error",
+  },
+};
diff --git a/dom/media/mediasource/test/1516754.webm b/dom/media/mediasource/test/1516754.webm
new file mode 100644
index 0000000000..05a008d906
Binary files /dev/null and b/dom/media/mediasource/test/1516754.webm differ
diff --git a/dom/media/mediasource/test/1516754.webm^headers^ b/dom/media/mediasource/test/1516754.webm^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/1516754.webm^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac20-48000-64000-1.m4s b/dom/media/mediasource/test/aac20-48000-64000-1.m4s
new file mode 100644
index 0000000000..56506e1f2d
Binary files /dev/null and b/dom/media/mediasource/test/aac20-48000-64000-1.m4s differ
diff --git a/dom/media/mediasource/test/aac20-48000-64000-1.m4s^headers^ b/dom/media/mediasource/test/aac20-48000-64000-1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac20-48000-64000-1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac20-48000-64000-2.m4s b/dom/media/mediasource/test/aac20-48000-64000-2.m4s
new file mode 100644
index 0000000000..3faff17ebf
Binary files /dev/null and b/dom/media/mediasource/test/aac20-48000-64000-2.m4s differ
diff --git a/dom/media/mediasource/test/aac20-48000-64000-2.m4s^headers^ b/dom/media/mediasource/test/aac20-48000-64000-2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac20-48000-64000-2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac20-48000-64000-init.mp4 b/dom/media/mediasource/test/aac20-48000-64000-init.mp4
new file mode 100644
index 0000000000..b70e016512
Binary files /dev/null and b/dom/media/mediasource/test/aac20-48000-64000-init.mp4 differ
diff --git a/dom/media/mediasource/test/aac20-48000-64000-init.mp4^headers^ b/dom/media/mediasource/test/aac20-48000-64000-init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac20-48000-64000-init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac51-48000-128000-1.m4s b/dom/media/mediasource/test/aac51-48000-128000-1.m4s
new file mode 100644
index 0000000000..3424acfecc
Binary files /dev/null and b/dom/media/mediasource/test/aac51-48000-128000-1.m4s differ
diff --git a/dom/media/mediasource/test/aac51-48000-128000-1.m4s^headers^ b/dom/media/mediasource/test/aac51-48000-128000-1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac51-48000-128000-1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac51-48000-128000-2.m4s b/dom/media/mediasource/test/aac51-48000-128000-2.m4s
new file mode 100644
index 0000000000..b02bfd043d
Binary files /dev/null and b/dom/media/mediasource/test/aac51-48000-128000-2.m4s differ
diff --git a/dom/media/mediasource/test/aac51-48000-128000-2.m4s^headers^ b/dom/media/mediasource/test/aac51-48000-128000-2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac51-48000-128000-2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/aac51-48000-128000-init.mp4 b/dom/media/mediasource/test/aac51-48000-128000-init.mp4
new file mode 100644
index 0000000000..7d62401f28
Binary files /dev/null and b/dom/media/mediasource/test/aac51-48000-128000-init.mp4 differ
diff --git a/dom/media/mediasource/test/aac51-48000-128000-init.mp4^headers^ b/dom/media/mediasource/test/aac51-48000-128000-init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/aac51-48000-128000-init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/avc3/init.mp4 b/dom/media/mediasource/test/avc3/init.mp4
new file mode 100644
index 0000000000..12fc38bd20
Binary files /dev/null and b/dom/media/mediasource/test/avc3/init.mp4 differ
diff --git a/dom/media/mediasource/test/avc3/init.mp4^headers^ b/dom/media/mediasource/test/avc3/init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/avc3/init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/avc3/segment1.m4s b/dom/media/mediasource/test/avc3/segment1.m4s
new file mode 100644
index 0000000000..d95a6adf02
Binary files /dev/null and b/dom/media/mediasource/test/avc3/segment1.m4s differ
diff --git a/dom/media/mediasource/test/avc3/segment1.m4s^headers^ b/dom/media/mediasource/test/avc3/segment1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/avc3/segment1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop1.m4s b/dom/media/mediasource/test/bipbop/bipbop1.m4s
new file mode 100644
index 0000000000..a237f2e91e
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop10.m4s b/dom/media/mediasource/test/bipbop/bipbop10.m4s
new file mode 100644
index 0000000000..d1f5e6a0b0
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop10.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop10.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop10.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop10.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop11.m4s b/dom/media/mediasource/test/bipbop/bipbop11.m4s
new file mode 100644
index 0000000000..57232fb359
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop11.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop11.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop11.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop11.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop12.m4s b/dom/media/mediasource/test/bipbop/bipbop12.m4s
new file mode 100644
index 0000000000..f9b18713ee
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop12.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop12.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop12.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop12.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop13.m4s b/dom/media/mediasource/test/bipbop/bipbop13.m4s
new file mode 100644
index 0000000000..f2a876946c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop13.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop13.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop13.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop13.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop2.m4s b/dom/media/mediasource/test/bipbop/bipbop2.m4s
new file mode 100644
index 0000000000..baa0d8578c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop2s.mp4 b/dom/media/mediasource/test/bipbop/bipbop2s.mp4
new file mode 100644
index 0000000000..4fd8b9cb6e
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop2s.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop2s.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop2s.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop2s.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop3.m4s b/dom/media/mediasource/test/bipbop/bipbop3.m4s
new file mode 100644
index 0000000000..ed313e668c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop3.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop3.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop3.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop3.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop4.m4s b/dom/media/mediasource/test/bipbop/bipbop4.m4s
new file mode 100644
index 0000000000..7709ac08c5
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop4.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop4.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop4.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop4.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop5.m4s b/dom/media/mediasource/test/bipbop/bipbop5.m4s
new file mode 100644
index 0000000000..6d36788e44
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop5.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop5.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop5.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop5.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop6.m4s b/dom/media/mediasource/test/bipbop/bipbop6.m4s
new file mode 100644
index 0000000000..64f475c700
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop6.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop6.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop6.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop6.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop7.m4s b/dom/media/mediasource/test/bipbop/bipbop7.m4s
new file mode 100644
index 0000000000..c148918d6d
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop7.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop7.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop7.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop7.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop8.m4s b/dom/media/mediasource/test/bipbop/bipbop8.m4s
new file mode 100644
index 0000000000..707dd48485
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop8.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop8.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop8.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop8.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop9.m4s b/dom/media/mediasource/test/bipbop/bipbop9.m4s
new file mode 100644
index 0000000000..538cf72a4d
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop9.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop9.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop9.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop9.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm b/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm
new file mode 100644
index 0000000000..db578dc96c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm^headers^ b/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_300-3s.webm^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s
new file mode 100644
index 0000000000..3dad336e8e
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s
new file mode 100644
index 0000000000..dd7491241f
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-video2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4 b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4
new file mode 100644
index 0000000000..b1a2d44058
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_480_624kbps-videoinit.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s
new file mode 100644
index 0000000000..33da98b5a9
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s
new file mode 100644
index 0000000000..36a98afd29
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio10.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s
new file mode 100644
index 0000000000..23d4aa8d86
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio11.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s
new file mode 100644
index 0000000000..96f4bcc344
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s
new file mode 100644
index 0000000000..7de4bd0ca1
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio3.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s
new file mode 100644
index 0000000000..494c71eb92
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio4.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s
new file mode 100644
index 0000000000..b50496b6ce
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio5.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s
new file mode 100644
index 0000000000..02cf4d363c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio6.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s
new file mode 100644
index 0000000000..bb2252889f
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio7.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s
new file mode 100644
index 0000000000..04a6a7af91
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio8.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s b/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s
new file mode 100644
index 0000000000..cb94b529a7
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audio9.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4 b/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4
new file mode 100644
index 0000000000..bbf272197d
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_audioinit.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_dash.mpd b/dom/media/mediasource/test/bipbop/bipbop_dash.mpd
new file mode 100644
index 0000000000..532cdc65d5
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_dash.mpd
@@ -0,0 +1,48 @@
+<?xml version="1.0"?>
+<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" minBufferTime="PT1.500000S" type="static" mediaPresentationDuration="PT0H0M9.98S" profiles="urn:mpeg:dash:profile:full:2011">
+ <ProgramInformation moreInformationURL="http://gpac.sourceforge.net">
+  <Title>bipbop_dash.mpd handcrafted by JYA</Title>
+ </ProgramInformation>
+
+ <Period duration="PT0H0M9.98S">
+  <AdaptationSet segmentAlignment="true" maxWidth="400" maxHeight="300" maxFrameRate="90000" par="4:3" lang="und">
+   <Representation id="1" mimeType="video/mp4" codecs="avc1.4d4015" width="400" height="300" frameRate="90000" sar="1:1" startWithSAP="1" bandwidth="226425">
+    <SegmentList timescale="90000" duration="69043">
+     <Initialization sourceURL="bipbop_videoinit.mp4"/>
+     <SegmentURL media="bipbop_video1.m4s"/>
+     <SegmentURL media="bipbop_video2.m4s"/>
+     <SegmentURL media="bipbop_video3.m4s"/>
+     <SegmentURL media="bipbop_video4.m4s"/>
+     <SegmentURL media="bipbop_video5.m4s"/>
+     <SegmentURL media="bipbop_video6.m4s"/>
+     <SegmentURL media="bipbop_video7.m4s"/>
+     <SegmentURL media="bipbop_video8.m4s"/>
+     <SegmentURL media="bipbop_video9.m4s"/>
+     <SegmentURL media="bipbop_video10.m4s"/>
+     <SegmentURL media="bipbop_video11.m4s"/>
+     <SegmentURL media="bipbop_video12.m4s"/>
+     <SegmentURL media="bipbop_video13.m4s"/>
+    </SegmentList>
+   </Representation>
+  </AdaptationSet>
+  <AdaptationSet segmentAlignment="true" lang="und">
+   <Representation id="1" mimeType="audio/mp4" codecs="mp4a.40.2" audioSamplingRate="22050" startWithSAP="1" bandwidth="7206">
+    <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
+    <SegmentList timescale="22050" duration="20101">
+     <Initialization sourceURL="bipbop_audioinit.mp4"/>
+     <SegmentURL media="bipbop_audio1.m4s"/>
+     <SegmentURL media="bipbop_audio2.m4s"/>
+     <SegmentURL media="bipbop_audio3.m4s"/>
+     <SegmentURL media="bipbop_audio4.m4s"/>
+     <SegmentURL media="bipbop_audio5.m4s"/>
+     <SegmentURL media="bipbop_audio6.m4s"/>
+     <SegmentURL media="bipbop_audio7.m4s"/>
+     <SegmentURL media="bipbop_audio8.m4s"/>
+     <SegmentURL media="bipbop_audio9.m4s"/>
+     <SegmentURL media="bipbop_audio10.m4s"/>
+     <SegmentURL media="bipbop_audio11.m4s"/>
+    </SegmentList>
+   </Representation>
+  </AdaptationSet>
+ </Period>
+</MPD>
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s
new file mode 100644
index 0000000000..2b95d49de9
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s
new file mode 100644
index 0000000000..3d95e7e2bf
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4 b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4
new file mode 100644
index 0000000000..cc7a48b5ce
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.0-init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s
new file mode 100644
index 0000000000..d67c4ef4cc
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s
new file mode 100644
index 0000000000..be155dbb9c
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4 b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4
new file mode 100644
index 0000000000..b67beb9548
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.1-init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s
new file mode 100644
index 0000000000..2056aaec7f
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s
new file mode 100644
index 0000000000..ccdad15c39
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4 b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4
new file mode 100644
index 0000000000..5b618c64d8
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_offset_0.2-init.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
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index 0000000000..fa5d454277
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video1.m4s b/dom/media/mediasource/test/bipbop/bipbop_video1.m4s
new file mode 100644
index 0000000000..9291182516
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video1.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video1.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video10.m4s b/dom/media/mediasource/test/bipbop/bipbop_video10.m4s
new file mode 100644
index 0000000000..72c7afaca7
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video10.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video10.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video10.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video10.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video11.m4s b/dom/media/mediasource/test/bipbop/bipbop_video11.m4s
new file mode 100644
index 0000000000..e6109f5e71
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video11.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video11.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video11.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video11.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video12.m4s b/dom/media/mediasource/test/bipbop/bipbop_video12.m4s
new file mode 100644
index 0000000000..5c54a510f7
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video12.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video12.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video12.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video12.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video13.m4s b/dom/media/mediasource/test/bipbop/bipbop_video13.m4s
new file mode 100644
index 0000000000..c64f38a337
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video13.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video13.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video13.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video13.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video2.m4s b/dom/media/mediasource/test/bipbop/bipbop_video2.m4s
new file mode 100644
index 0000000000..cd34fae561
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video2.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video2.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video2.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video2.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video3.m4s b/dom/media/mediasource/test/bipbop/bipbop_video3.m4s
new file mode 100644
index 0000000000..5a13340043
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video3.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video3.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video3.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video3.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video4.m4s b/dom/media/mediasource/test/bipbop/bipbop_video4.m4s
new file mode 100644
index 0000000000..e8d96b6ed1
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video4.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video4.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video4.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video4.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video5.m4s b/dom/media/mediasource/test/bipbop/bipbop_video5.m4s
new file mode 100644
index 0000000000..ca6a820468
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video5.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video5.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video5.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video5.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video6.m4s b/dom/media/mediasource/test/bipbop/bipbop_video6.m4s
new file mode 100644
index 0000000000..fe9824355b
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video6.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video6.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video6.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video6.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video7.m4s b/dom/media/mediasource/test/bipbop/bipbop_video7.m4s
new file mode 100644
index 0000000000..3351fa6859
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video7.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video7.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video7.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video7.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video8.m4s b/dom/media/mediasource/test/bipbop/bipbop_video8.m4s
new file mode 100644
index 0000000000..af26ae5f9e
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video8.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video8.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video8.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video8.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video9.m4s b/dom/media/mediasource/test/bipbop/bipbop_video9.m4s
new file mode 100644
index 0000000000..25be672c15
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_video9.m4s differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_video9.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_video9.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_video9.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4 b/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4
new file mode 100644
index 0000000000..7c9c533c36
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_videoinit.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bipbop/bipbopinit.mp4 b/dom/media/mediasource/test/bipbop/bipbopinit.mp4
new file mode 100644
index 0000000000..39f0575a71
Binary files /dev/null and b/dom/media/mediasource/test/bipbop/bipbopinit.mp4 differ
diff --git a/dom/media/mediasource/test/bipbop/bipbopinit.mp4^headers^ b/dom/media/mediasource/test/bipbop/bipbopinit.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbopinit.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/bug1718709_high_res.mp4 b/dom/media/mediasource/test/bug1718709_high_res.mp4
new file mode 100644
index 0000000000..3f211d2370
Binary files /dev/null and b/dom/media/mediasource/test/bug1718709_high_res.mp4 differ
diff --git a/dom/media/mediasource/test/bug1718709_low_res.mp4 b/dom/media/mediasource/test/bug1718709_low_res.mp4
new file mode 100644
index 0000000000..dc5cd6b7f1
Binary files /dev/null and b/dom/media/mediasource/test/bug1718709_low_res.mp4 differ
diff --git a/dom/media/mediasource/test/crashtests/1005366.html b/dom/media/mediasource/test/crashtests/1005366.html
new file mode 100644
index 0000000000..aa8b7f652e
--- /dev/null
+++ b/dom/media/mediasource/test/crashtests/1005366.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+
+/*
+user_pref("media.mediasource.enabled", true);
+*/
+
+function boom()
+{
+    var source = new window.MediaSource();
+    var videoElement = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
+    videoElement.src = URL.createObjectURL(source);
+
+    setTimeout(function() {
+        var buf = source.addSourceBuffer("video/webm");
+        buf.abort();
+        buf.appendBuffer(new Float32Array(203));
+    }, 0);
+}
+
+</script>
+</head>
+<body onload="boom();"></body>
+</html>
diff --git a/dom/media/mediasource/test/crashtests/1059035.html b/dom/media/mediasource/test/crashtests/1059035.html
new file mode 100644
index 0000000000..9dfda34b82
--- /dev/null
+++ b/dom/media/mediasource/test/crashtests/1059035.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script>
+
+/*
+user_pref("media.mediasource.enabled", true);
+*/
+
+function boom()
+{
+    var mediaSource = new MediaSource();
+    var htmlAudio = document.createElement("audio");
+    htmlAudio.src = URL.createObjectURL(mediaSource);
+
+    setTimeout(function() {
+        var sourceBuffer = mediaSource.addSourceBuffer("video/webm");
+        mediaSource.removeSourceBuffer(sourceBuffer);
+        sourceBuffer.remove(0, 0);
+    }, 0);
+}
+
+</script>
+</head>
+<body onload="boom();"></body>
+</html>
diff --git a/dom/media/mediasource/test/crashtests/926665.html b/dom/media/mediasource/test/crashtests/926665.html
new file mode 100644
index 0000000000..ccac5a7644
--- /dev/null
+++ b/dom/media/mediasource/test/crashtests/926665.html
@@ -0,0 +1,26 @@
+<html>
+<head>
+<meta charset="UTF-8">
+<script style="display: none;" id="fuzz1" type="text/javascript">
+
+function boom()
+{
+    var mediaSource = new window.MediaSource();
+    var mediaSourceURL = URL.createObjectURL(mediaSource);
+    var v1 = document.createElement('video');
+    v1.src = mediaSourceURL;
+    mediaSource.addEventListener("sourceopen", function (e) {
+        var v2 = document.createElement('video');
+        v2.src = mediaSourceURL;
+        setTimeout(function () {
+            v2.src = "data:text/plain,1";
+            v1.src = "data:text/plain,2";
+        }, 0);
+    });
+}
+
+</script>
+</head>
+
+<body onload="boom();"></body>
+</html>
diff --git a/dom/media/mediasource/test/crashtests/931388.html b/dom/media/mediasource/test/crashtests/931388.html
new file mode 100644
index 0000000000..cdb5bd9add
--- /dev/null
+++ b/dom/media/mediasource/test/crashtests/931388.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+
+function boom()
+{
+  var v = document.createElement('video');
+  v.src = URL.createObjectURL(new MediaSource());
+  v.play();
+}
+
+</script>
+</head>
+<body onload="boom();"></body>
+</html>
diff --git a/dom/media/mediasource/test/crashtests/crashtests.list b/dom/media/mediasource/test/crashtests/crashtests.list
new file mode 100644
index 0000000000..e16ec261d2
--- /dev/null
+++ b/dom/media/mediasource/test/crashtests/crashtests.list
@@ -0,0 +1,4 @@
+test-pref(media.mediasource.enabled,true) load 926665.html
+test-pref(media.mediasource.enabled,true) load 931388.html
+test-pref(media.mediasource.enabled,true) load 1005366.html
+test-pref(media.mediasource.enabled,true) load 1059035.html
diff --git a/dom/media/mediasource/test/flac/00001.m4s b/dom/media/mediasource/test/flac/00001.m4s
new file mode 100644
index 0000000000..02745ba2f8
Binary files /dev/null and b/dom/media/mediasource/test/flac/00001.m4s differ
diff --git a/dom/media/mediasource/test/flac/00001.m4s^headers^ b/dom/media/mediasource/test/flac/00001.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/flac/00001.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/flac/00002.m4s b/dom/media/mediasource/test/flac/00002.m4s
new file mode 100644
index 0000000000..cd6b1f5949
Binary files /dev/null and b/dom/media/mediasource/test/flac/00002.m4s differ
diff --git a/dom/media/mediasource/test/flac/00002.m4s^headers^ b/dom/media/mediasource/test/flac/00002.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/flac/00002.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/flac/00003.m4s b/dom/media/mediasource/test/flac/00003.m4s
new file mode 100644
index 0000000000..c5b78e1ce0
Binary files /dev/null and b/dom/media/mediasource/test/flac/00003.m4s differ
diff --git a/dom/media/mediasource/test/flac/00003.m4s^headers^ b/dom/media/mediasource/test/flac/00003.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/flac/00003.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/flac/IS.mp4 b/dom/media/mediasource/test/flac/IS.mp4
new file mode 100644
index 0000000000..7f108602fd
Binary files /dev/null and b/dom/media/mediasource/test/flac/IS.mp4 differ
diff --git a/dom/media/mediasource/test/flac/IS.mp4^headers^ b/dom/media/mediasource/test/flac/IS.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/flac/IS.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/init-trackid2.mp4 b/dom/media/mediasource/test/init-trackid2.mp4
new file mode 100644
index 0000000000..c96da9d4df
Binary files /dev/null and b/dom/media/mediasource/test/init-trackid2.mp4 differ
diff --git a/dom/media/mediasource/test/init-trackid2.mp4^headers^ b/dom/media/mediasource/test/init-trackid2.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/init-trackid2.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/init-trackid3.mp4 b/dom/media/mediasource/test/init-trackid3.mp4
new file mode 100644
index 0000000000..e37d8ea098
Binary files /dev/null and b/dom/media/mediasource/test/init-trackid3.mp4 differ
diff --git a/dom/media/mediasource/test/init-trackid3.mp4^headers^ b/dom/media/mediasource/test/init-trackid3.mp4^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/init-trackid3.mp4^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/mediasource.js b/dom/media/mediasource/test/mediasource.js
new file mode 100644
index 0000000000..440b05009f
--- /dev/null
+++ b/dom/media/mediasource/test/mediasource.js
@@ -0,0 +1,233 @@
+// Helpers for Media Source Extensions tests
+
+let gMSETestPrefs = [
+  ["media.mediasource.enabled", true],
+  ["media.audio-max-decode-error", 0],
+  ["media.video-max-decode-error", 0],
+];
+
+// Called before runWithMSE() to set the prefs before running MSE tests.
+function addMSEPrefs(...prefs) {
+  gMSETestPrefs = gMSETestPrefs.concat(prefs);
+}
+
+async function runWithMSE(testFunction) {
+  await once(window, "load");
+  await SpecialPowers.pushPrefEnv({ set: gMSETestPrefs });
+
+  const ms = new MediaSource();
+
+  const el = document.createElement("video");
+  el.src = URL.createObjectURL(ms);
+  el.preload = "auto";
+
+  document.body.appendChild(el);
+  SimpleTest.registerCleanupFunction(() => {
+    el.remove();
+    el.removeAttribute("src");
+    el.load();
+  });
+  try {
+    await testFunction(ms, el);
+  } catch (e) {
+    ok(false, `${testFunction.name} failed with error ${e.name}`);
+    throw e;
+  }
+}
+
+async function fetchWithXHR(uri) {
+  return new Promise(resolve => {
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", uri, true);
+    xhr.responseType = "arraybuffer";
+    xhr.addEventListener("load", function() {
+      is(
+        xhr.status,
+        200,
+        "fetchWithXHR load uri='" + uri + "' status=" + xhr.status
+      );
+      resolve(xhr.response);
+    });
+    xhr.send();
+  });
+}
+
+function range(start, end) {
+  const rv = [];
+  for (let i = start; i < end; ++i) {
+    rv.push(i);
+  }
+  return rv;
+}
+
+function must_throw(f, msg, error = true) {
+  try {
+    f();
+    ok(!error, msg);
+  } catch (e) {
+    ok(error, msg);
+    if (error === true) {
+      ok(
+        false,
+        `Please provide name of expected error! Got ${e.name}: ${e.message}.`
+      );
+    } else if (e.name != error) {
+      throw e;
+    }
+  }
+}
+
+async function must_reject(f, msg, error = true) {
+  try {
+    await f();
+    ok(!error, msg);
+  } catch (e) {
+    ok(error, msg);
+    if (error === true) {
+      ok(
+        false,
+        `Please provide name of expected error! Got ${e.name}: ${e.message}.`
+      );
+    } else if (e.name != error) {
+      throw e;
+    }
+  }
+}
+
+const wait = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+const must_not_throw = (f, msg) => must_throw(f, msg, false);
+const must_not_reject = (f, msg) => must_reject(f, msg, false);
+
+async function once(target, name) {
+  return new Promise(r => target.addEventListener(name, r, { once: true }));
+}
+
+function timeRangeToString(r) {
+  let str = "TimeRanges: ";
+  for (let i = 0; i < r.length; i++) {
+    str += "[" + r.start(i) + ", " + r.end(i) + ")";
+  }
+  return str;
+}
+
+async function loadSegment(sb, typedArrayOrArrayBuffer) {
+  const typedArray =
+    typedArrayOrArrayBuffer instanceof ArrayBuffer
+      ? new Uint8Array(typedArrayOrArrayBuffer)
+      : typedArrayOrArrayBuffer;
+  info(
+    `Loading buffer: [${typedArray.byteOffset}, ${typedArray.byteOffset +
+      typedArray.byteLength})`
+  );
+  const beforeBuffered = timeRangeToString(sb.buffered);
+  const p = once(sb, "update");
+  sb.appendBuffer(typedArray);
+  await p;
+  const afterBuffered = timeRangeToString(sb.buffered);
+  info(
+    `SourceBuffer buffered ranges grew from ${beforeBuffered} to ${afterBuffered}`
+  );
+}
+
+async function fetchAndLoad(sb, prefix, chunks, suffix) {
+  // Fetch the buffers in parallel.
+  const buffers = await Promise.all(
+    chunks.map(c => fetchWithXHR(prefix + c + suffix))
+  );
+
+  // Load them in series, as required per spec.
+  for (const buffer of buffers) {
+    await loadSegment(sb, buffer);
+  }
+}
+
+function loadSegmentAsync(sb, typedArrayOrArrayBuffer) {
+  const typedArray =
+    typedArrayOrArrayBuffer instanceof ArrayBuffer
+      ? new Uint8Array(typedArrayOrArrayBuffer)
+      : typedArrayOrArrayBuffer;
+  info(
+    `Loading buffer2: [${typedArray.byteOffset}, ${typedArray.byteOffset +
+      typedArray.byteLength})`
+  );
+  const beforeBuffered = timeRangeToString(sb.buffered);
+  return sb.appendBufferAsync(typedArray).then(() => {
+    const afterBuffered = timeRangeToString(sb.buffered);
+    info(
+      `SourceBuffer buffered ranges grew from ${beforeBuffered} to ${afterBuffered}`
+    );
+  });
+}
+
+function fetchAndLoadAsync(sb, prefix, chunks, suffix) {
+  // Fetch the buffers in parallel.
+  const buffers = {};
+  const fetches = [];
+  for (const chunk of chunks) {
+    fetches.push(
+      fetchWithXHR(prefix + chunk + suffix).then(
+        ((c, x) => (buffers[c] = x)).bind(null, chunk)
+      )
+    );
+  }
+
+  // Load them in series, as required per spec.
+  return Promise.all(fetches).then(function() {
+    let rv = Promise.resolve();
+    for (const chunk of chunks) {
+      rv = rv.then(loadSegmentAsync.bind(null, sb, buffers[chunk]));
+    }
+    return rv;
+  });
+}
+
+// Register timeout function to dump debugging logs.
+SimpleTest.registerTimeoutFunction(async function() {
+  for (const v of document.getElementsByTagName("video")) {
+    console.log(await SpecialPowers.wrap(v).mozRequestDebugInfo());
+  }
+  for (const a of document.getElementsByTagName("audio")) {
+    console.log(await SpecialPowers.wrap(a).mozRequestDebugInfo());
+  }
+});
+
+async function waitUntilTime(target, targetTime) {
+  await new Promise(resolve => {
+    target.addEventListener("waiting", function onwaiting() {
+      info("Got a waiting event at " + target.currentTime);
+      if (target.currentTime >= targetTime) {
+        target.removeEventListener("waiting", onwaiting);
+        resolve();
+      }
+    });
+  });
+  ok(true, "Reached target time of: " + targetTime);
+}
+
+// Log events for debugging.
+
+function logEvents(el) {
+  [
+    "suspend",
+    "play",
+    "canplay",
+    "canplaythrough",
+    "loadstart",
+    "loadedmetadata",
+    "loadeddata",
+    "playing",
+    "ended",
+    "error",
+    "stalled",
+    "emptied",
+    "abort",
+    "waiting",
+    "pause",
+    "durationchange",
+    "seeking",
+    "seeked",
+  ].forEach(type =>
+    el.addEventListener(type, e => info(`got ${e.type} event`))
+  );
+}
diff --git a/dom/media/mediasource/test/mochitest.ini b/dom/media/mediasource/test/mochitest.ini
new file mode 100644
index 0000000000..7e5c504559
--- /dev/null
+++ b/dom/media/mediasource/test/mochitest.ini
@@ -0,0 +1,211 @@
+[DEFAULT]
+subsuite = media
+support-files =
+  mediasource.js
+  seek.webm seek.webm^headers^
+  seek_lowres.webm seek_lowres.webm^headers^
+  bipbop/bipbop_300-3s.webm bipbop/bipbop_300-3s.webm^headers^
+  bipbop/bipbop2s.mp4 bipbop/bipbop2s.mp4^headers^
+  bipbop/bipbop_trailing_skip_box_video1.m4s
+  bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
+  bipbop/bipbopinit.mp4 bipbop/bipbop_audioinit.mp4 bipbop/bipbop_videoinit.mp4
+  bipbop/bipbop1.m4s bipbop/bipbop_audio1.m4s bipbop/bipbop_video1.m4s
+  bipbop/bipbop2.m4s bipbop/bipbop_audio2.m4s bipbop/bipbop_video2.m4s
+  bipbop/bipbop3.m4s bipbop/bipbop_audio3.m4s bipbop/bipbop_video3.m4s
+  bipbop/bipbop4.m4s bipbop/bipbop_audio4.m4s bipbop/bipbop_video4.m4s
+  bipbop/bipbop5.m4s bipbop/bipbop_audio5.m4s bipbop/bipbop_video5.m4s
+  bipbop/bipbop6.m4s bipbop/bipbop_audio6.m4s bipbop/bipbop_video6.m4s
+  bipbop/bipbop7.m4s bipbop/bipbop_audio7.m4s bipbop/bipbop_video7.m4s
+  bipbop/bipbop8.m4s bipbop/bipbop_audio8.m4s bipbop/bipbop_video8.m4s
+  bipbop/bipbop9.m4s bipbop/bipbop_audio9.m4s bipbop/bipbop_video9.m4s
+  bipbop/bipbop10.m4s bipbop/bipbop_audio10.m4s bipbop/bipbop_video10.m4s
+  bipbop/bipbop11.m4s bipbop/bipbop_audio11.m4s bipbop/bipbop_video11.m4s
+  bipbop/bipbop12.m4s bipbop/bipbop_video12.m4s
+  bipbop/bipbop13.m4s bipbop/bipbop_video13.m4s
+  bipbop/bipbopinit.mp4^headers^ bipbop/bipbop_audioinit.mp4^headers^ bipbop/bipbop_videoinit.mp4^headers^
+  bipbop/bipbop1.m4s^headers^ bipbop/bipbop_audio1.m4s^headers^ bipbop/bipbop_video1.m4s^headers^
+  bipbop/bipbop2.m4s^headers^ bipbop/bipbop_audio2.m4s^headers^ bipbop/bipbop_video2.m4s^headers^
+  bipbop/bipbop3.m4s^headers^ bipbop/bipbop_audio3.m4s^headers^ bipbop/bipbop_video3.m4s^headers^
+  bipbop/bipbop4.m4s^headers^ bipbop/bipbop_audio4.m4s^headers^ bipbop/bipbop_video4.m4s^headers^
+  bipbop/bipbop5.m4s^headers^ bipbop/bipbop_audio5.m4s^headers^ bipbop/bipbop_video5.m4s^headers^
+  bipbop/bipbop6.m4s^headers^ bipbop/bipbop_audio6.m4s^headers^ bipbop/bipbop_video6.m4s^headers^
+  bipbop/bipbop7.m4s^headers^ bipbop/bipbop_audio7.m4s^headers^ bipbop/bipbop_video7.m4s^headers^
+  bipbop/bipbop8.m4s^headers^ bipbop/bipbop_audio8.m4s^headers^ bipbop/bipbop_video8.m4s^headers^
+  bipbop/bipbop9.m4s^headers^ bipbop/bipbop_audio9.m4s^headers^ bipbop/bipbop_video9.m4s^headers^
+  bipbop/bipbop10.m4s^headers^ bipbop/bipbop_audio10.m4s^headers^ bipbop/bipbop_video10.m4s^headers^
+  bipbop/bipbop11.m4s^headers^ bipbop/bipbop_audio11.m4s^headers^ bipbop/bipbop_video11.m4s^headers^
+  bipbop/bipbop12.m4s^headers^ bipbop/bipbop_video12.m4s^headers^
+  bipbop/bipbop13.m4s^headers^ bipbop/bipbop_video13.m4s^headers^
+  bipbop/bipbop_offset_0.0-1.m4s
+  bipbop/bipbop_offset_0.0-1.m4s^headers^
+  bipbop/bipbop_offset_0.0-2.m4s
+  bipbop/bipbop_offset_0.0-2.m4s^headers^
+  bipbop/bipbop_offset_0.0-init.mp4
+  bipbop/bipbop_offset_0.0-init.mp4^headers^
+  bipbop/bipbop_offset_0.1-1.m4s
+  bipbop/bipbop_offset_0.1-1.m4s^headers^
+  bipbop/bipbop_offset_0.1-2.m4s
+  bipbop/bipbop_offset_0.1-2.m4s^headers^
+  bipbop/bipbop_offset_0.1-init.mp4
+  bipbop/bipbop_offset_0.1-init.mp4^headers^
+  bipbop/bipbop_offset_0.2-1.m4s
+  bipbop/bipbop_offset_0.2-1.m4s^headers^
+  bipbop/bipbop_offset_0.2-2.m4s
+  bipbop/bipbop_offset_0.2-2.m4s^headers^
+  bipbop/bipbop_offset_0.2-init.mp4
+  bipbop/bipbop_offset_0.2-init.mp4^headers^
+  bipbop/bipbop_offset_0.3-1.m4s
+  bipbop/bipbop_offset_0.3-1.m4s^headers^
+  bipbop/bipbop_offset_0.3-2.m4s
+  bipbop/bipbop_offset_0.3-2.m4s^headers^
+  bipbop/bipbop_offset_0.3-init.mp4
+  bipbop/bipbop_offset_0.3-init.mp4^headers^
+  bipbop/bipbop_offset_0.4-1.m4s
+  bipbop/bipbop_offset_0.4-1.m4s^headers^
+  bipbop/bipbop_offset_0.4-2.m4s
+  bipbop/bipbop_offset_0.4-2.m4s^headers^
+  bipbop/bipbop_offset_0.4-init.mp4
+  bipbop/bipbop_offset_0.4-init.mp4^headers^
+  bipbop/bipbop_offset_0.5-1.m4s
+  bipbop/bipbop_offset_0.5-1.m4s^headers^
+  bipbop/bipbop_offset_0.5-2.m4s
+  bipbop/bipbop_offset_0.5-2.m4s^headers^
+  bipbop/bipbop_offset_0.5-init.mp4
+  bipbop/bipbop_offset_0.5-init.mp4^headers^
+  bipbop/bipbop_offset_0.6-1.m4s
+  bipbop/bipbop_offset_0.6-1.m4s^headers^
+  bipbop/bipbop_offset_0.6-2.m4s
+  bipbop/bipbop_offset_0.6-2.m4s^headers^
+  bipbop/bipbop_offset_0.6-init.mp4
+  bipbop/bipbop_offset_0.6-init.mp4^headers^
+  bipbop/bipbop_offset_0.7-1.m4s
+  bipbop/bipbop_offset_0.7-1.m4s^headers^
+  bipbop/bipbop_offset_0.7-2.m4s
+  bipbop/bipbop_offset_0.7-2.m4s^headers^
+  bipbop/bipbop_offset_0.7-init.mp4
+  bipbop/bipbop_offset_0.7-init.mp4^headers^
+  bipbop/bipbop_offset_0.8-1.m4s
+  bipbop/bipbop_offset_0.8-1.m4s^headers^
+  bipbop/bipbop_offset_0.8-2.m4s
+  bipbop/bipbop_offset_0.8-2.m4s^headers^
+  bipbop/bipbop_offset_0.8-init.mp4
+  bipbop/bipbop_offset_0.8-init.mp4^headers^
+  bipbop/bipbop_offset_0.9-1.m4s
+  bipbop/bipbop_offset_0.9-1.m4s^headers^
+  bipbop/bipbop_offset_0.9-2.m4s
+  bipbop/bipbop_offset_0.9-2.m4s^headers^
+  bipbop/bipbop_offset_0.9-init.mp4
+  bipbop/bipbop_offset_0.9-init.mp4^headers^
+  bipbop/bipbop_offset_1.0-1.m4s
+  bipbop/bipbop_offset_1.0-1.m4s^headers^
+  bipbop/bipbop_offset_1.0-2.m4s
+  bipbop/bipbop_offset_1.0-2.m4s^headers^
+  bipbop/bipbop_offset_1.0-init.mp4
+  bipbop/bipbop_offset_1.0-init.mp4^headers^
+  bipbop/bipbop_offset_1.1-1.m4s
+  bipbop/bipbop_offset_1.1-1.m4s^headers^
+  bipbop/bipbop_offset_1.1-2.m4s
+  bipbop/bipbop_offset_1.1-2.m4s^headers^
+  bipbop/bipbop_offset_1.1-init.mp4
+  bipbop/bipbop_offset_1.1-init.mp4^headers^
+  aac20-48000-64000-init.mp4   aac20-48000-64000-init.mp4^headers^
+  aac20-48000-64000-1.m4s aac20-48000-64000-1.m4s^headers^
+  aac20-48000-64000-2.m4s aac20-48000-64000-2.m4s^headers^
+  aac51-48000-128000-init.mp4 aac51-48000-128000-init.mp4^headers^
+  aac51-48000-128000-1.m4s aac51-48000-128000-1.m4s^headers^
+  aac51-48000-128000-2.m4s aac51-48000-128000-2.m4s^headers^
+  bipbop/bipbop_480_624kbps-videoinit.mp4 bipbop/bipbop_480_624kbps-videoinit.mp4^headers^
+  bipbop/bipbop_480_624kbps-video1.m4s bipbop/bipbop_480_624kbps-video1.m4s^headers^
+  bipbop/bipbop_480_624kbps-video2.m4s bipbop/bipbop_480_624kbps-video2.m4s^headers^
+  flac/IS.mp4 flac/IS.mp4^headers^ flac/00001.m4s flac/00001.m4s^headers^
+  flac/00002.m4s flac/00002.m4s^headers^ flac/00003.m4s flac/00003.m4s^headers^
+  avc3/init.mp4 avc3/init.mp4^headers^ avc3/segment1.m4s avc3/segment1.m4s^headers^
+  tags_before_cluster.webm
+  tags_before_cluster.webm^header^
+  1516754.webm 1516754.webm^headers^
+  init-trackid2.mp4 init-trackid3.mp4 segment-2.0001.m4s segment-2.0002.m4s segment-3.0001.m4s segment-3.0002.m4s
+  init-trackid2.mp4^headers^ init-trackid3.mp4^headers^ segment-2.0001.m4s^headers^ segment-2.0002.m4s^headers^
+  segment-3.0001.m4s^headers^ segment-3.0002.m4s^headers^
+  wmf_mismatchedaudiotime.mp4
+  bug1718709_low_res.mp4
+  bug1718709_high_res.mp4
+  whitenoise-he-aac-5s.mp4
+
+[test_AbortAfterPartialMediaSegment.html]
+[test_AppendPartialInitSegment.html]
+[test_AVC3_mp4.html]
+[test_AudioChange_mp4.html]
+[test_AudioChange_mp4_WebAudio.html]
+[test_AutoRevocation.html]
+tags = firstpartyisolation
+[test_BufferedSeek.html]
+[test_BufferedSeek_mp4.html]
+[test_BufferingWait.html]
+[test_BufferingWait_mp4.html]
+[test_ChangeType.html]
+[test_ChangeWhileWaitingOnMissingData_mp4.html]
+[test_DifferentStreamStartTimes.html]
+[test_DrainOnMissingData_mp4.html]
+[test_DurationChange.html]
+[test_DurationUpdated.html]
+[test_DurationUpdated_mp4.html]
+[test_EndedEvent.html]
+[test_EndOfStream.html]
+[test_EndOfStream_mp4.html]
+[test_Eviction_mp4.html]
+[test_ExperimentalAsync.html]
+[test_FrameSelection.html]
+skip-if = toolkit == 'android' # bug 1341519, bug 1401090
+[test_FrameSelection_mp4.html]
+skip-if = os == 'win' # bug 1487973,
+    (os == 'mac') # mac due to bug 1487973
+[test_HaveMetadataUnbufferedSeek.html]
+[test_HaveMetadataUnbufferedSeek_mp4.html]
+[test_HEAAC_extradata.html]
+[test_InputBufferIsCleared.html]
+[test_LiveSeekable.html]
+[test_LoadedDataFired_mp4.html]
+[test_LoadedMetadataFired.html]
+[test_LoadedMetadataFired_mp4.html]
+[test_MediaSource.html]
+[test_MediaSource_capture_gc.html]
+[test_MediaSource_memory_reporting.html]
+[test_MediaSource_mp4.html]
+[test_MediaSource_flac_mp4.html]
+[test_MediaSource_disabled.html]
+[test_MultipleInitSegments.html]
+[test_MultipleInitSegments_mp4.html]
+[test_OnEvents.html]
+[test_PlayEvents.html]
+[test_PlayEventsAutoPlaying.html]
+[test_PlayEventsAutoPlaying2.html]
+[test_RemoveSourceBuffer.html]
+[test_Resolution_change_should_not_cause_video_freeze.html]
+[test_ResumeAfterClearing_mp4.html]
+[test_SeekableBeforeAndAfterEndOfStream.html]
+[test_SeekableBeforeAndAfterEndOfStream_mp4.html]
+[test_SeekableBeforeAndAfterEndOfStreamSplit.html]
+[test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html]
+[test_SeekNoData_mp4.html]
+[test_SeekedEvent_mp4.html]
+[test_SeekToEnd_mp4.html]
+[test_SeekToLastFrame_mp4.html]
+[test_SeekTwice_mp4.html]
+[test_Sequence_mp4.html]
+[test_SetModeThrows.html]
+[test_SplitAppendDelay.html]
+[test_SplitAppendDelay_mp4.html]
+[test_SplitAppend.html]
+[test_SplitAppend_mp4.html]
+[test_Threshold_mp4.html]
+[test_TimestampOffset_mp4.html]
+[test_trackidchange_mp4.html]
+[test_TruncatedDuration.html]
+[test_TruncatedDuration_mp4.html]
+[test_WaitingOnMissingData.html]
+[test_WaitingOnMissingData_mp4.html]
+[test_WaitingOnMissingDataEnded_mp4.html]
+[test_WaitingToEndedTransition_mp4.html]
+skip-if = (os == 'linux') # Bug 1495167
+[test_WebMTagsBeforeCluster.html]
+[test_WMFUnmatchedAudioDataTime.html]
diff --git a/dom/media/mediasource/test/seek.webm b/dom/media/mediasource/test/seek.webm
new file mode 100644
index 0000000000..72b0297233
Binary files /dev/null and b/dom/media/mediasource/test/seek.webm differ
diff --git a/dom/media/mediasource/test/seek.webm^headers^ b/dom/media/mediasource/test/seek.webm^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/seek.webm^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/seek_lowres.webm b/dom/media/mediasource/test/seek_lowres.webm
new file mode 100644
index 0000000000..8a76e06470
Binary files /dev/null and b/dom/media/mediasource/test/seek_lowres.webm differ
diff --git a/dom/media/mediasource/test/seek_lowres.webm^headers^ b/dom/media/mediasource/test/seek_lowres.webm^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/seek_lowres.webm^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/segment-2.0001.m4s b/dom/media/mediasource/test/segment-2.0001.m4s
new file mode 100644
index 0000000000..b63fd6aaa6
Binary files /dev/null and b/dom/media/mediasource/test/segment-2.0001.m4s differ
diff --git a/dom/media/mediasource/test/segment-2.0001.m4s^headers^ b/dom/media/mediasource/test/segment-2.0001.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/segment-2.0001.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/segment-2.0002.m4s b/dom/media/mediasource/test/segment-2.0002.m4s
new file mode 100644
index 0000000000..3a0051f10e
Binary files /dev/null and b/dom/media/mediasource/test/segment-2.0002.m4s differ
diff --git a/dom/media/mediasource/test/segment-2.0002.m4s^headers^ b/dom/media/mediasource/test/segment-2.0002.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/segment-2.0002.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/segment-3.0001.m4s b/dom/media/mediasource/test/segment-3.0001.m4s
new file mode 100644
index 0000000000..71e33f0e8f
Binary files /dev/null and b/dom/media/mediasource/test/segment-3.0001.m4s differ
diff --git a/dom/media/mediasource/test/segment-3.0001.m4s^headers^ b/dom/media/mediasource/test/segment-3.0001.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/segment-3.0001.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/segment-3.0002.m4s b/dom/media/mediasource/test/segment-3.0002.m4s
new file mode 100644
index 0000000000..10a3ce695d
Binary files /dev/null and b/dom/media/mediasource/test/segment-3.0002.m4s differ
diff --git a/dom/media/mediasource/test/segment-3.0002.m4s^headers^ b/dom/media/mediasource/test/segment-3.0002.m4s^headers^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/segment-3.0002.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/tags_before_cluster.webm b/dom/media/mediasource/test/tags_before_cluster.webm
new file mode 100644
index 0000000000..cf7d596b0e
Binary files /dev/null and b/dom/media/mediasource/test/tags_before_cluster.webm differ
diff --git a/dom/media/mediasource/test/tags_before_cluster.webm^header^ b/dom/media/mediasource/test/tags_before_cluster.webm^header^
new file mode 100644
index 0000000000..4030ea1d3d
--- /dev/null
+++ b/dom/media/mediasource/test/tags_before_cluster.webm^header^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/test_AVC3_mp4.html b/dom/media/mediasource/test/test_AVC3_mp4.html
new file mode 100644
index 0000000000..dd20feed06
--- /dev/null
+++ b/dom/media/mediasource/test/test_AVC3_mp4.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: AVC3 content playback.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+
+  await fetchAndLoad(videosb, "avc3/init", [""], ".mp4");
+  const p = once(el, "loadeddata");
+  await fetchAndLoad(videosb, "avc3/segment", range(1, 2), ".m4s");
+  await p;
+  is(videosb.buffered.length, 1, "continuous buffered range");
+  ok(true, "got loadeddata");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+  ok(true, "endOfStream completed");
+  // Now ensure that we can play to the end.
+  el.play();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_AbortAfterPartialMediaSegment.html b/dom/media/mediasource/test/test_AbortAfterPartialMediaSegment.html
new file mode 100644
index 0000000000..4c695f48c7
--- /dev/null
+++ b/dom/media/mediasource/test/test_AbortAfterPartialMediaSegment.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: can properly resume after a partial media segment header followed by abort </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+const VIDEO_CODEC_STRING = 'video/webm; codecs="vp09.00.51.08.01.01.01.01"';
+
+const logError = (error) => {
+  console.error(error, error.message);
+  ok(false, "should not reach here");
+};
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+
+  const supported = MediaSource.isTypeSupported(VIDEO_CODEC_STRING);
+  if (!supported) {
+    ok(true, "vp9 isn't supported on this platform, abort");
+    SimpleTest.finish();
+    return;
+  }
+  const sb = ms.addSourceBuffer(VIDEO_CODEC_STRING);
+
+  const arrayBuffer = await fetchWithXHR("1516754.webm");
+  info("- append init segment, a media segment and a partial media segment header -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 87355 + 3000));
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  // start seeking.
+  v.currentTime = 11;
+  v.addEventListener("seeked", () => {
+    info("- seek completed -");
+    SimpleTest.finish();
+  });
+
+  sb.abort();
+
+  info("- append init segment -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 3150));
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+  info("- append media segment 10-15s -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 159968, 72931));
+
+  // We now wait for seek to complete
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_AppendPartialInitSegment.html b/dom/media/mediasource/test/test_AppendPartialInitSegment.html
new file mode 100644
index 0000000000..408c073bd6
--- /dev/null
+++ b/dom/media/mediasource/test/test_AppendPartialInitSegment.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: split init segment and append them separately </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  // init segment is total 236 bytes.
+  info("- append partial init segment -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 100));
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- append remaining init segment -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 100, 136));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+  is(v.videoWidth, 320, "videoWidth has correct initial value");
+  is(v.videoHeight, 240, "videoHeight has correct initial value");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_AudioChange_mp4.html b/dom/media/mediasource/test/test_AudioChange_mp4.html
new file mode 100644
index 0000000000..9051af05a1
--- /dev/null
+++ b/dom/media/mediasource/test/test_AudioChange_mp4.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks loading a stereo segment, followed by a 5.1 segment plays without error.
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  logEvents(el);
+
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(audiosb, "aac20-48000-64000-", ["init"], ".mp4");
+  await p;
+  ok(true, "got loadedmetadata event");
+  p = Promise.all([once(el, "loadeddata"), once(el, "canplay")]);
+  await fetchAndLoad(audiosb, "aac20-48000-64000-", ["1"], ".m4s");
+  await p;
+  ok(true, "got canplay event");
+  el.play();
+  await fetchAndLoad(audiosb, "aac51-48000-128000-", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "aac51-48000-128000-", ["2"], ".m4s");
+  ms.endOfStream();
+  await once(el, "ended");
+  ok(el.currentTime >= 6, "played to the end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_AudioChange_mp4_WebAudio.html b/dom/media/mediasource/test/test_AudioChange_mp4_WebAudio.html
new file mode 100644
index 0000000000..c76342f793
--- /dev/null
+++ b/dom/media/mediasource/test/test_AudioChange_mp4_WebAudio.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks loading a stereo segment, followed by a 5.1 segment plays
+// without error, when the audio is being routed to an AudioContext.
+
+const ac = new AudioContext();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  const source = ac.createMediaElementSource(el);
+  source.connect(ac.destination);
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  logEvents(el);
+
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(audiosb, "aac20-48000-64000-", ["init"], ".mp4");
+  await p;
+  ok(true, "got loadedmetadata event");
+  p = Promise.all([once(el, "loadeddata"), once(el, "canplay")]);
+  await fetchAndLoad(audiosb, "aac20-48000-64000-", ["1"], ".m4s");
+  await p;
+  ok(true, "got canplay event");
+  el.play();
+  await fetchAndLoad(audiosb, "aac51-48000-128000-", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "aac51-48000-128000-", ["2"], ".m4s");
+  ms.endOfStream();
+  await once(el, "ended");
+  ok(el.currentTime >= 6, "played to the end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_AutoRevocation.html b/dom/media/mediasource/test/test_AutoRevocation.html
new file mode 100644
index 0000000000..42e9b0e6a5
--- /dev/null
+++ b/dom/media/mediasource/test/test_AutoRevocation.html
@@ -0,0 +1,40 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: auto-revocation</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(function() {
+  const ms = new MediaSource();
+  const o = URL.createObjectURL(ms);
+  const v = document.createElement("video");
+
+  v.addEventListener("error", () => {
+    ok(true, "ObjectURL should be auto-revoked");
+    SimpleTest.finish();
+  });
+
+  v.addEventListener("stalled", () => {
+    ok(false, "If auto-revocation is gone, please turn on TODOs in browser_mediaSourceURL.js");
+    SimpleTest.finish();
+  });
+
+  setTimeout(function() {
+    v.src = o;
+    v.preload = "auto";
+    document.body.appendChild(v);
+  }, 0);
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_BufferedSeek.html b/dom/media/mediasource/test/test_BufferedSeek.html
new file mode 100644
index 0000000000..039f56bc16
--- /dev/null
+++ b/dom/media/mediasource/test/test_BufferedSeek.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seeking in buffered range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm")));
+
+  const target = 2;
+
+  v.addEventListener("loadedmetadata", () => {
+    ok(true, "received loadedmetadata");
+    v.currentTime = target;
+  });
+
+  let wasSeeking = false;
+
+  v.addEventListener("seeking", () => {
+    wasSeeking = true;
+    is(v.currentTime, target, "Video currentTime at target");
+  });
+
+  await once(v, "seeked");
+  ok(wasSeeking, "Received expected seeking and seeked events");
+  is(v.currentTime, target, "Video currentTime at target");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_BufferedSeek_mp4.html b/dom/media/mediasource/test/test_BufferedSeek_mp4.html
new file mode 100644
index 0000000000..e89e972c91
--- /dev/null
+++ b/dom/media/mediasource/test/test_BufferedSeek_mp4.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seeking in buffered range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+
+  const target = 1.3;
+
+  await once(v, "loadedmetadata");
+  ok(true, "received loadedmetadata");
+  v.currentTime = target;
+
+  let wasSeeking = false;
+
+  v.addEventListener("seeking", () => {
+    wasSeeking = true;
+    is(v.currentTime, target, "Video currentTime at target");
+  });
+
+  await once(v, "seeked");
+  ok(wasSeeking, "Received expected seeking and seeked events");
+  is(v.currentTime, target, "Video currentTime at target");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_BufferingWait.html b/dom/media/mediasource/test/test_BufferingWait.html
new file mode 100644
index 0000000000..289ddfe4d2
--- /dev/null
+++ b/dom/media/mediasource/test/test_BufferingWait.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Don't get stuck buffering for too long when we have frames to show</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  ms.addEventListener("sourceopen", () => ok(false, "No more sourceopen"));
+  const sb = ms.addSourceBuffer("video/webm");
+  ok(sb, "Create a SourceBuffer");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 0, 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 318, 25523 - 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 25523, 46712 - 25523));
+  /* Note - Missing |46712, 67833 - 46712| segment here corresponding to (0.8, 1.2] */
+  /* Note - Missing |67833, 88966 - 67833| segment here corresponding to (1.2, 1.6]  */
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 88966));
+  // 0.767 is the time of the last video sample +- 40ms.
+  info("Playing video. It should play for a bit, then fire 'waiting'");
+  v.play();
+  await waitUntilTime(v, .767 - 0.04);
+  const firstStop = Date.now();
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 46712, 67833 - 46712));
+  await waitUntilTime(v, 1.167 - 0.04);
+  const waitDuration = (Date.now() - firstStop) / 1000;
+  ok(waitDuration < 15, `Should not spend inordinate amount of time buffering: ${waitDuration}`);
+  SimpleTest.finish();
+  /* If we allow the rest of the stream to be played, we get stuck at
+     around 2s. See bug 1093133.
+  await once(v, "ended");
+  SimpleTest.finish();
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 67833, 88966 - 67833));
+  */
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_BufferingWait_mp4.html b/dom/media/mediasource/test/test_BufferingWait_mp4.html
new file mode 100644
index 0000000000..04e094a852
--- /dev/null
+++ b/dom/media/mediasource/test/test_BufferingWait_mp4.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Don't get stuck buffering for too long when we have frames to show</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  ms.addEventListener("sourceopen", () => ok(false, "No more sourceopen"));
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  await fetchAndLoad(sb, "bipbop/bipbop", ["init"], ".mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop", ["1"], ".m4s");
+  await fetchAndLoad(sb, "bipbop/bipbop", ["2"], ".m4s");
+  /* Note - Missing |bipbop3| segment here corresponding to (1.62, 2.41] */
+  /* Note - Missing |bipbop4| segment here corresponding to (2.41, 3.20]  */
+  await fetchAndLoad(sb, "bipbop/bipbop", ["5"], ".m4s");
+  // last audio sample has a start time of 1.578956s
+  info("Playing video. It should play for a bit, then fire 'waiting'");
+  v.play();
+  await waitUntilTime(v, 1.57895);
+  const firstStop = Date.now();
+  await fetchAndLoad(sb, "bipbop/bipbop", ["3"], ".m4s");
+  // last audio sample has a start time of 2.368435
+  await waitUntilTime(v, 2.36843);
+  const waitDuration = (Date.now() - firstStop) / 1000;
+  ok(waitDuration < 15, `Should not spend inordinate amount of time buffering: ${waitDuration}`);
+  await fetchAndLoad(sb, "bipbop/bipbop", ["4"], ".m4s");
+  ms.endOfStream();
+  await once(v, "ended");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_ChangeType.html b/dom/media/mediasource/test/test_ChangeType.html
new file mode 100644
index 0000000000..690b9f61c4
--- /dev/null
+++ b/dom/media/mediasource/test/test_ChangeType.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: changeType allow to change container and codec type</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(function(ms, el) {
+  el.controls = true;
+  once(ms, "sourceopen").then(function() {
+    // Log events for debugging.
+    const events = ["suspend", "play", "canplay", "canplaythrough", "loadstart", "loadedmetadata",
+                    "loadeddata", "playing", "ended", "error", "stalled", "emptied", "abort",
+                    "waiting", "pause", "durationchange", "seeking", "seeked"];
+    function logEvent(e) {
+      info("got " + e.type + " event");
+    }
+    events.forEach(function(e) {
+      el.addEventListener(e, logEvent);
+    });
+
+    ok(true, "Receive a sourceopen event");
+
+    const videosb = ms.addSourceBuffer("video/mp4");
+    if (typeof videosb.changeType === "undefined") {
+      info("changeType API is not available");
+    }
+
+    el.addEventListener("error", e => {
+      ok(false, "should not fire '" + e.type + "' event");
+      SimpleTest.finish();
+    });
+    is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+    const loadedmetadataPromises = [];
+    loadedmetadataPromises.push(fetchAndLoad(videosb, "bipbop/bipbop", ["init"], ".mp4"));
+    loadedmetadataPromises.push(once(el, "loadedmetadata"));
+    Promise.all(loadedmetadataPromises)
+    .then(function() {
+      ok(true, "got loadedmetadata event");
+      const canplayPromises = [];
+      canplayPromises.push(once(el, "loadeddata"));
+      canplayPromises.push(once(el, "canplay"));
+      canplayPromises.push(fetchAndLoad(videosb, "bipbop/bipbop", range(1, 3), ".m4s"));
+      return Promise.all(canplayPromises);
+    })
+    .then(function() {
+      ok(true, "got canplay event");
+      el.play();
+      videosb.timestampOffset = el.buffered.end(0);
+      return fetchAndLoad(videosb, "bipbop/bipbop_480_624kbps-video", ["init"], ".mp4");
+    })
+    .then(fetchAndLoad.bind(null, videosb, "bipbop/bipbop_480_624kbps-video", range(1, 3), ".m4s"))
+    .then(function() {
+      videosb.timestampOffset = el.buffered.end(0);
+      try {
+        videosb.changeType("video/webm");
+      } catch (e) {
+        ok(false, "shouldn't throw an exception");
+        SimpleTest.finish();
+        throw e;
+      }
+      return fetchAndLoad(videosb, "bipbop/bipbop_300-3s", [""], ".webm");
+    })
+    .then(function() {
+      ms.endOfStream();
+      return once(el, "ended");
+    })
+    .then(function() {
+      ok(el.currentTime >= el.buffered.end(0), "played to the end");
+      SimpleTest.finish();
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_ChangeWhileWaitingOnMissingData_mp4.html b/dom/media/mediasource/test/test_ChangeWhileWaitingOnMissingData_mp4.html
new file mode 100644
index 0000000000..b5889da560
--- /dev/null
+++ b/dom/media/mediasource/test/test_ChangeWhileWaitingOnMissingData_mp4.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: resume from waiting even after format change occurred</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const sb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", ["init"], ".mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", range(1, 3), ".m4s");
+  el.play();
+  // let seek to the last audio frame.
+  // The seek will complete and then playback will stall.
+  el.currentTime = 1.532517;
+  await Promise.all([once(el, "seeked"), once(el, "waiting")]);
+  info("seek completed");
+  await fetchAndLoad(sb, "bipbop/bipbop", ["init"], ".mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop", range(1, 4), ".m4s");
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_DifferentStreamStartTimes.html b/dom/media/mediasource/test/test_DifferentStreamStartTimes.html
new file mode 100644
index 0000000000..197e809e4f
--- /dev/null
+++ b/dom/media/mediasource/test/test_DifferentStreamStartTimes.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: Mismatched stream start time playback test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  el.autoplay = true;
+  for (let i = 0; i <= 0.5; i += 0.1) {
+    const offset = i.toFixed(1);
+
+    info("----------------------");
+    info("Running test for mismatched stream start times with offset of: " + offset);
+    info("----------------------");
+
+    ms = new MediaSource();
+    el.removeAttribute("src");
+    el.src = URL.createObjectURL(ms);
+
+    await once(ms, "sourceopen");
+    logEvents(el);
+    const videosb = ms.addSourceBuffer("video/mp4");
+    ok(true, "Receive a sourceopen event");
+
+    el.addEventListener("error", e => {
+      ok(false, `should not fire ${e.type} event`);
+      SimpleTest.finish();
+    });
+
+    let p = once(el, "loadedmetadata");
+    await fetchAndLoad(videosb, "bipbop/bipbop_offset_" + offset + "-", ["init"], ".mp4");
+    await p;
+    ok(true, "got loadedmetadata event");
+
+    p = Promise.all(["loadeddata", "canplay", "play", "playing"].map(e => once(el, e)));
+    await fetchAndLoad(videosb, "bipbop/bipbop_offset_" + offset + "-", range(1, 2), ".m4s");
+    el.play();
+    await p;
+  }
+  ok(true, "got all required event");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_DrainOnMissingData_mp4.html b/dom/media/mediasource/test/test_DrainOnMissingData_mp4.html
new file mode 100644
index 0000000000..ddc503aebf
--- /dev/null
+++ b/dom/media/mediasource/test/test_DrainOnMissingData_mp4.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  // Set appendWindowEnd to ensure we only have about 6 frames worth.
+  // We must feed at least 6 frames to pass the MDSM pre-roll.
+  videosb.appendWindowEnd = .4;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["1"], ".m4s");
+  info("Invoking play()");
+  const p = once(el, "playing");
+  await el.play();
+  await p;
+  info("got playing");
+  await once(el, "waiting");
+  info("got waiting");
+  info("Loading more data");
+  // Waiting will be fired on the last frame +- 40ms.
+  isfuzzy(el.currentTime, videosb.buffered.end(0) - 1 / 30,
+          0.04, `Got a waiting event at ${el.currentTime}`);
+  videosb.appendWindowEnd = 1;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", [1], ".m4s");
+  ms.endOfStream();
+  await once(el, "ended");
+  // These fuzz factors are bigger than they should be. We should investigate
+  // and fix them in bug 1137574.
+  is(el.duration, 0.801666, "Video has correct duration: " + el.duration);
+  is(el.currentTime, el.duration, "Video has correct currentTime.");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_DurationChange.html b/dom/media/mediasource/test/test_DurationChange.html
new file mode 100644
index 0000000000..3c83e83fa4
--- /dev/null
+++ b/dom/media/mediasource/test/test_DurationChange.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: check that duration change behaves properly</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+  await Promise.all([once(v, "loadedmetadata"), once(sb, "updateend")]);
+  is(v.duration, ms.duration, "video duration is mediasource one");
+  must_not_throw(() => ms.duration = 0, "duration = 0 is valid initially");
+  is(v.duration, 0, "reducing duration with no data buffered is valid");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+  // Adding more data will fire durationchange.
+  await once(sb, "updateend");
+  ok(true, "got updateend");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  must_throw(() => ms.duration = 0,
+             "Must use remove for range removal",
+             "InvalidStateError");
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  must_not_throw(() => ms.duration = 10, "setting duration past data is valid");
+  is(v.duration, 10, "extending duration is always valid");
+  // The last sample has a start time of 3.967000s and a end time of 4.001 (see bug 1065207).
+  must_not_throw(() => ms.duration = 3.967000,
+                 "setting duration with >= highest frame presentation time is valid");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_not_throw(() => ms.duration = 3.97,
+                 "setting duration with >= highest frame presentation time is valid");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_throw(() => ms.duration = 3.96,
+             "setting duration with < highest frame presentation time is not valid",
+             "InvalidStateError");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_throw(() => ms.duration = -1, "can't set a negative duration", "TypeError");
+  sb.remove(sb.buffered.end(0), Infinity);
+  is(sb.updating, true, "updating is true");
+  must_throw(() => ms.duration = Infinity,
+             "setting the duration while updating is not allowed",
+             "InvalidStateError");
+  must_throw(() => sb.abort(),
+             "Can't use abort while range removal is in progress",
+             "InvalidStateError");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_DurationUpdated.html b/dom/media/mediasource/test/test_DurationUpdated.html
new file mode 100644
index 0000000000..eb54e76c90
--- /dev/null
+++ b/dom/media/mediasource/test/test_DurationUpdated.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append data and check that mediasource duration got updated</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  let durationChangeCount = 0;
+  v.addEventListener("durationchange", () => durationChangeCount++);
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+
+  // Adding the first init segment will fire a durationchange.
+  await Promise.all([once(sb, "updateend"), once(v, "loadedmetadata")]);
+  ok(true, "got loadedmetadata");
+  // Set mediasource duration to 0, so future appendBuffer
+  // will update the mediasource duration.
+  // Changing the duration will fire a durationchange.
+  ms.duration = 0;
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+  // Adding more data will fire durationchange.
+  await once(sb, "updateend");
+  ok(true, "got updateend");
+  // this will not fire durationchange as new duration == old duration
+  ms.endOfStream();
+  await once(ms, "sourceended");
+  is(durationChangeCount, 3, "durationchange not fired as many times as expected");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_DurationUpdated_mp4.html b/dom/media/mediasource/test/test_DurationUpdated_mp4.html
new file mode 100644
index 0000000000..f263264b09
--- /dev/null
+++ b/dom/media/mediasource/test/test_DurationUpdated_mp4.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append data and check that mediasource duration got updated</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  let durationChangeCount = 0;
+  v.addEventListener("durationchange", () => durationChangeCount++);
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 1395));
+
+  // Adding the first init segment will fire a durationchange.
+  await Promise.all([once(sb, "updateend"), once(v, "loadedmetadata")]);
+  ok(true, "got loadedmetadata");
+  // Set mediasource duration to 0, so future appendBuffer
+  // will update the mediasource duration.
+  // Changing the duration will fire a durationchange.
+  ms.duration = 0;
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 1395));
+  // Adding more data will fire durationchange.
+  await once(sb, "updateend");
+  ok(true, "got updateend");
+  // this will not fire durationchange as new duration == old duration
+  ms.endOfStream();
+  await once(ms, "sourceended");
+  is(durationChangeCount, 3, "durationchange not fired as many times as expected");
+  is(v.duration, 1.696666, "Video has correct duration");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_EndOfStream.html b/dom/media/mediasource/test/test_EndOfStream.html
new file mode 100644
index 0000000000..b926869f1f
--- /dev/null
+++ b/dom/media/mediasource/test/test_EndOfStream.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: endOfStream call after an appendBuffer</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm"), 0, 88966));
+  await once(sb, "updateend");
+  await wait(0);
+  must_not_throw(() => ms.endOfStream(), "MediaSource.endOfStream succeeded");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_EndOfStream_mp4.html b/dom/media/mediasource/test/test_EndOfStream_mp4.html
new file mode 100644
index 0000000000..9319b80390
--- /dev/null
+++ b/dom/media/mediasource/test/test_EndOfStream_mp4.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: endOfStream call after an appendBuffer</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+  await once(sb, "updateend");
+  await wait(0);
+  must_not_throw(() => ms.endOfStream(), "MediaSource.endOfStream succeeded");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_EndedEvent.html b/dom/media/mediasource/test/test_EndedEvent.html
new file mode 100644
index 0000000000..ee43fa8cf5
--- /dev/null
+++ b/dom/media/mediasource/test/test_EndedEvent.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm")));
+  sb.addEventListener("updateend", () => ms.endOfStream());
+
+  // Test "ended" is fired when seeking to the end of the media
+  // once the duration is known.
+  ms.onsourceended = () => el.currentTime = el.duration;
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_Eviction_mp4.html b/dom/media/mediasource/test/test_Eviction_mp4.html
new file mode 100644
index 0000000000..e336fae4c7
--- /dev/null
+++ b/dom/media/mediasource/test/test_Eviction_mp4.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: QuotaExceededError when source buffer is full</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+// We fill up the source buffer with audio data until the buffer is full.
+// We ensure that QuotaExceededError is thrown once the buffer is full.
+// We then seek to half the content. By that time, another appendBuffer must succeed
+// as the auto-eviction would succeed (removing all data prior currentTime)
+
+addMSEPrefs(
+  ["media.mediasource.eviction_threshold.audio", 524288],
+  ["media.dormant-on-pause-timeout-ms", -1] // FIXME: bug 1319292
+);
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  audiosb.mode = "sequence";
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  const audioBuffer = await fetchWithXHR("bipbop/bipbop_audio1.m4s");
+
+  await must_reject(async () => {
+    // We are appending data repeatedly in sequence mode, there should be no gaps.
+    while (true) {
+      ok(audiosb.buffered.length <= 1, "there should be no gap in buffered ranges.");
+      audiosb.appendBuffer(audioBuffer);
+      await once(audiosb, "updateend");
+    }
+  },
+  "Fill up SourceBuffer by appending data until an exception is thrown.",
+  "QuotaExceededError");
+
+  is(audiosb.buffered.end(0), el.duration, "Duration is end of buffered range");
+  const seekTime = audiosb.buffered.end(0) / 2;
+  el.currentTime = seekTime;
+  await once(el, "seeked");
+  dump("dump: seeked to " + seekTime);
+  is(el.currentTime, seekTime, "correctly seeked to " + seekTime);
+  try {
+    audiosb.appendBuffer(audioBuffer);
+    await once(audiosb, "update");
+    ok(true, "appendBuffer succeeded");
+  } catch (ex) {
+    ok(false, "Shouldn't throw another time when data can be evicted");
+    dump(JSON.stringify(await SpecialPowers.wrap(el).mozRequestDebugInfo()));
+  }
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_ExperimentalAsync.html b/dom/media/mediasource/test/test_ExperimentalAsync.html
new file mode 100644
index 0000000000..6617716f26
--- /dev/null
+++ b/dom/media/mediasource/test/test_ExperimentalAsync.html
@@ -0,0 +1,102 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: testing removeAsync and appendBufferAsync</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+addMSEPrefs(
+  ["media.mediasource.eviction_threshold.audio", 524288],
+  ["media.dormant-on-pause-timeout-ms", -1], // FIXME: bug 1319292
+  ["media.mediasource.experimental.enabled", true]
+);
+
+// We fill up the source buffer with audio data until the buffer is full.
+// We ensure that QuotaExceededError is thrown once the buffer is full.
+// We then seek to half the content. By that time, another appendBuffer must succeed
+// as the auto-eviction would succeed (removing all data prior currentTime)
+// The test then fills the audio buffer and plays until the end.
+
+// Fill up the SourceBuffer by appending data repeatedly via doAppendDataFunc until
+// an exception is thrown.
+async function fillUpSourceBuffer(sourceBuffer, doAppendDataFunc, onCaughtExceptionCallback) {
+  try {
+    // We are appending data repeatedly in sequence mode, there should be no gaps.
+    while (true) {
+      ok(sourceBuffer.buffered.length <= 1, "there should be no gap in buffered ranges.");
+      await doAppendDataFunc();
+    }
+  } catch (ex) {
+    ok(true, "appendBuffer promise got rejected");
+    onCaughtExceptionCallback(ex);
+  }
+}
+
+runWithMSE(async function(ms, el) {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+
+  // Test removeAsync
+  audiosb.mode = "sequence";
+  const audioInitBuffer = await fetchWithXHR("bipbop/bipbop_audioinit.mp4");
+  await audiosb.appendBufferAsync(audioInitBuffer);
+  const audioBuffer = await fetchWithXHR("bipbop/bipbop_audio1.m4s");
+  fillUpSourceBuffer(audiosb,
+    function() { // doAppendDataFunc
+      return audiosb.appendBufferAsync(audioBuffer);
+    },
+    async function(ex1) { // onCaughtExceptionCallback
+      is(ex1.name, "QuotaExceededError", "QuotaExceededError thrown");
+      is(audiosb.buffered.end(0), el.duration, "Duration is end of buffered range");
+      const seekTime = audiosb.buffered.end(0) / 2;
+      el.currentTime = seekTime;
+      await once(el, "seeked");
+      dump("dump: seeked to " + seekTime);
+      is(el.currentTime, seekTime, "correctly seeked to " + seekTime);
+      await audiosb.appendBufferAsync(audioBuffer).catch(async function(ex2) {
+        ok(false, "Shouldn't throw another time when data can be evicted");
+        dump(JSON.stringify(await SpecialPowers.wrap(el).mozRequestDebugInfo()));
+        SimpleTest.finish();
+      });
+      // Test that an error in remove return a rejected promise
+      await audiosb.removeAsync(5, 0).catch(async function(ex3) {
+        ok(true, "remove promise got rejected with end <= start");
+        is(ex3.name, "TypeError");
+        await audiosb.removeAsync(ms.duration + 1, Infinity).catch(async function(ex4) {
+          ok(true, "remove promise got rejected with start > duration");
+          is(ex4.name, "TypeError");
+          await audiosb.removeAsync(0, Infinity).catch(function(ex5) {
+            ok(false, "shouldn't throw");
+          });
+          ok(true, "remove succeeded");
+          is(audiosb.buffered.length, 0, "buffered should be empty");
+          audiosb.mode = "segment";
+          audiosb.timestampOffset = 0;
+          el.currentTime = 0;
+          await fetchAndLoadAsync(audiosb, "bipbop/bipbop_audio", range(1, 4), ".m4s");
+          ms.endOfStream();
+          el.play();
+          await once(el, "ended");
+          is(el.currentTime, el.duration, "played to the end");
+          SimpleTest.finish();
+          throw ex4; // ensure we don't fallback on lines below.
+        });
+        ok(false, "should have returned an error");
+      });
+      ok(false, "should have returned an error");
+    }
+  );
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_FrameSelection.html b/dom/media/mediasource/test/test_FrameSelection.html
new file mode 100644
index 0000000000..3e696841c2
--- /dev/null
+++ b/dom/media/mediasource/test/test_FrameSelection.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: verify correct frames selected for given position</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  let arrayBuffer = await fetchWithXHR("seek.webm");
+  let p = once(v, "loadedmetadata");
+  // Append entire file covering range [0, 4].
+  sb.appendBuffer(new Uint8Array(arrayBuffer));
+  await p;
+  is(v.currentTime, 0, "currentTime has correct initial value");
+  is(v.videoWidth, 320, "videoWidth has correct initial value");
+  is(v.videoHeight, 240, "videoHeight has correct initial value");
+
+  arrayBuffer = await fetchWithXHR("seek_lowres.webm");
+  // Append initialization segment.
+  info("Appending low-res init segment");
+  p = once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 438));
+  await p;
+
+  info("Appending low-res range [2,4]");
+  // Append media segment covering range [2, 4].
+  p = once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 51003));
+  await p;
+
+  ms.endOfStream();
+
+  info("Seeking to t=3");
+  p = Promise.all([once(v, "seeked"), once(v, "resize")]);
+  v.currentTime = 3;
+  await p;
+  is(v.currentTime, 3, "Video currentTime at target");
+  is(v.videoWidth, 160, "videoWidth has correct low-res value");
+  is(v.videoHeight, 120, "videoHeight has correct low-res value");
+
+  info("Seeking to t=1");
+  p = Promise.all([once(v, "seeked"), once(v, "resize")]);
+  v.currentTime = 1;
+  await p;
+  is(v.currentTime, 1, "Video currentTime at target");
+  is(v.videoWidth, 320, "videoWidth has correct high-res value");
+  is(v.videoHeight, 240, "videoHeight has correct high-res value");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_FrameSelection_mp4.html b/dom/media/mediasource/test/test_FrameSelection_mp4.html
new file mode 100644
index 0000000000..628b4bf0e9
--- /dev/null
+++ b/dom/media/mediasource/test/test_FrameSelection_mp4.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Don't get stuck buffering for too long when we have frames to show</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test loads partial video, plays and waits until playback stalls.
+// It then loads only 3 frames of a video at higher resolution.
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  ms.addEventListener("sourceopen", () => ok(false, "No more sourceopen"));
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+  logEvents(v);
+  sb.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  await fetchAndLoad(sb, "bipbop/bipbop", ["init"], ".mp4");
+  const p = once(v, "loadeddata");
+  await fetchAndLoad(sb, "bipbop/bipbop", range(1, 3), ".m4s");
+  await p;
+  is(sb.buffered.length, 1, "continuous range");
+  v.play();
+  // We have nothing to play, waiting will be fired.
+  await waitUntilTime(v, 1.5);
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", ["init"], ".mp4");
+  sb.timestampOffset = 1.601666; // End of the video track buffered - time of first video sample (0.095).
+  sb.appendWindowEnd = 1.796677; // Only allow room for three extra video frames (we need 3 as this video has b-frames).
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", ["1"], ".m4s");
+  ms.endOfStream();
+  await Promise.all([once(ms, "sourceended"), once(v, "playing"), once(v, "ended")]);
+  is(v.videoWidth, 640, "has proper width");
+  is(v.videoHeight, 480, "has proper height");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_HEAAC_extradata.html b/dom/media/mediasource/test/test_HEAAC_extradata.html
new file mode 100644
index 0000000000..9fbbec8d72
--- /dev/null
+++ b/dom/media/mediasource/test/test_HEAAC_extradata.html
@@ -0,0 +1,89 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>HE-AAC decoding test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+
+SimpleTest.waitForExplicitFinish();
+
+const SOURCE_FILE = "whitenoise-he-aac-5s.mp4";
+
+// This test checks when decoding HE-AAC using MediaSource or HTTP playback, the
+// audio is decoded correctly (in particular with the SBR part). This means
+// that the extradata describing the encoded AAC stream have been communicated
+// correctly to the audio decoder. For this, we check that there is energy
+// above 10kHz using the Web Audio API when playing white noise, which has
+// maximum energy accross the audible spectrum.
+
+// Return the index corresponding for a particular frequency in an array
+// containing frequency data from a FFT.
+function binIndexForFrequency(frequency, fftSize, sampleRate) {
+  return (1 + Math.round((frequency * fftSize) / sampleRate));
+}
+
+async function checkHighFrequencyContent(element) {
+  const ac = new AudioContext();
+  await ac.resume();
+  const mediaElementSource = ac.createMediaElementSource(element);
+  const analyser = new AnalyserNode(ac);
+
+  // Undo the volume scaling applied globally during test. This is fine because
+  // the audio isn't routed to an actual audio output device in this test, it's
+  // just analyzed with the Web Audio API.
+  const gain = new GainNode(ac);
+  const testVolumeScaling =
+    parseFloat(SpecialPowers.getCharPref("media.volume_scale"));
+  gain.gain.value = 1 / parseFloat(testVolumeScaling);
+  mediaElementSource.connect(gain).connect(analyser)
+
+  const spectrum = new Float32Array(analyser.frequencyBinCount);
+  const indexFor15kHz =
+    binIndexForFrequency(15000, analyser.fftSize, ac.sampleRate);
+  // Wait a few hundreds of milliseconds
+  while (!element.ended) {
+    await once(element, "timeupdate");
+    analyser.getFloatFrequencyData(spectrum);
+    if (spectrum[indexFor15kHz] > -50) {
+      ok(spectrum[indexFor15kHz] > -50,
+          `Energy present at 15kHz (bin index: ${indexFor15kHz}) when playing white noise encoded in HE-AAC ${spectrum[indexFor15kHz]}`);
+      return;
+    }
+  }
+  ok(false,
+      `No energy present at 15kHz (bin index: ${indexFor15kHz}) when playing white noise encoded in HE-AAC (last value ${spectrum[indexFor15kHz]})`);
+}
+
+runWithMSE(async (ms, el) => {
+  // First check with MSE playback
+  el.controls = true;
+  await once(ms, "sourceopen");
+
+  const audiosb = ms.addSourceBuffer('audio/mp4; codecs="mp4a.40.5"');
+  await fetchAndLoad(audiosb, SOURCE_FILE, [""], "");
+  ms.endOfStream();
+  el.play();
+  once(el, "playing");
+
+  await checkHighFrequencyContent(el);
+
+  // Redo the same test, with HTTP playback
+  el.src = SOURCE_FILE;
+  el.play();
+  once(el, "playing");
+
+  await checkHighFrequencyContent(el);
+
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html
new file mode 100644
index 0000000000..dd1b252f01
--- /dev/null
+++ b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute before end of stream</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 67833));
+
+  const target = 2;
+
+  await once(v, "loadeddata");
+  ok(v.readyState >= v.HAVE_CURRENT_DATA, "readyState is >= CURRENT_DATA");
+  v.currentTime = target;
+
+  await once(v, "seeking");
+  is(v.readyState, v.HAVE_METADATA, "readyState is HAVE_METADATA");
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm"), 67833));
+  await once(v, "seeked");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html
new file mode 100644
index 0000000000..9b8e885cda
--- /dev/null
+++ b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html
@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute before end of stream</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  // 25819 is the offset of the first media segment's end
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 25819));
+
+  const target = 1.3;
+
+  await once(v, "loadeddata");
+  ok(v.readyState >= v.HAVE_CURRENT_DATA, "readyState is >= CURRENT_DATA");
+  v.currentTime = target;
+
+  await once(v, "seeking");
+  is(v.readyState, v.HAVE_METADATA);
+  // 25819 is the offset of the first media segment's end
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 25819));
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(v, "seeked");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_InputBufferIsCleared.html b/dom/media/mediasource/test/test_InputBufferIsCleared.html
new file mode 100644
index 0000000000..bad9a0c558
--- /dev/null
+++ b/dom/media/mediasource/test/test_InputBufferIsCleared.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: input buffer is cleared as expected (bug 1697476)</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// Test bug 1697476 is fixed. We do this by appending a number of segments with
+// trailing `skip` boxes. If the bug is fixed, then the data from these appends
+// will eventually be cleared from memory. If not fixed, we leak that memory.
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_video", ["init"], ".mp4");
+  // Load ~1mb of media.
+  await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");
+  // Load ~1mb more media several more times.
+  const numberOfAppends = 5;
+  for (let i = 1; i < numberOfAppends; ++i) {
+    sb.timestampOffset = v.buffered.end(0);
+    await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");
+  }
+
+  // Grab a memory report. We'll use this to make sure we're not accumulating
+  // too much data in our buffers.
+  const mgr = SpecialPowers.Cc["@mozilla.org/memory-reporter-manager;1"]
+      .getService(SpecialPowers.Ci.nsIMemoryReporterManager);
+
+  let amount = 0;
+  const handleReport = (aProcess, aPath, aKind, aUnits, aAmount) => {
+    if (aPath == "explicit/media/resources") {
+      amount += aAmount;
+    }
+  };
+
+  await new Promise(r => mgr.getReports(handleReport, null, r, null, /* anonymized = */ false));
+  ok(true, "Yay didn't crash!");
+  ok(amount !== undefined, "Got media resources amount");
+  const sgementSize = 1023860;
+  // Set the limit to be equal to the total data we appended. If we're not
+  // clearing buffers, we'll have all the data from the appends + some other
+  // data, so will fail.
+  const limit = sgementSize * numberOfAppends - 1;
+  ok(amount < limit, `Should have less than ${limit} bytes of media usage. Got ${amount} bytes.`);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_LiveSeekable.html b/dom/media/mediasource/test/test_LiveSeekable.html
new file mode 100644
index 0000000000..b981ceba00
--- /dev/null
+++ b/dom/media/mediasource/test/test_LiveSeekable.html
@@ -0,0 +1,76 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: live seekable range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  // Load data with a +2 offset so that we can distinguish buffered range start
+  // and seekable range start.
+  sb.timestampOffset = 2;
+  const p = once(v, "loadedmetadata");
+  await fetchAndLoad(sb, "seek", [""], ".webm");
+  await p;
+  ms.duration = Infinity;
+  sb.abort();
+  is(sb.buffered.length, 1, "continuous buffered range");
+  is(sb.buffered.start(0), 2, "buffered range start at timestamp offset");
+  is(sb.buffered.end(0), 6.001, "buffered range end at original duration + timestamp offset");
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 0, "seekable range start at 0");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  // LiveSeekableRange.start < buffered.start
+  ms.setLiveSeekableRange(1, 5);
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 1, "seekable range start at live range start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  ms.clearLiveSeekableRange();
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 0, "seekable range start at 0");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  // LiveSeekableRange.end > buffered.end
+  ms.setLiveSeekableRange(1, 8);
+  is(v.seekable.start(0), 1, "seekable range start at live range start");
+  is(v.seekable.end(0), 8, "seekable range end at live range end");
+
+  // LiveSeekableRange.start > buffered.start
+  // LiveSeekableRange.end < buffered.end
+  ms.setLiveSeekableRange(3, 5);
+  is(v.seekable.start(0), sb.buffered.start(0), "seekable range start at buffered start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at live range end");
+
+  // LiveSeekableRange.start > buffered.end
+  ms.setLiveSeekableRange(8, 10);
+  is(v.seekable.start(0), sb.buffered.start(0), "seekable range start at buffered start");
+  is(v.seekable.end(0), 10, "seekable range end at live range end");
+
+  // LiveSeekableRange.end < buffered.start
+  ms.setLiveSeekableRange(0, 2);
+  is(v.seekable.start(0), 0, "seekable range start at live range start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  must_throw(() => ms.setLiveSeekableRange(2, 0),
+             "must thow if start > end",
+             "TypeError");
+
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_LoadedDataFired_mp4.html b/dom/media/mediasource/test/test_LoadedDataFired_mp4.html
new file mode 100644
index 0000000000..476303d4fd
--- /dev/null
+++ b/dom/media/mediasource/test/test_LoadedDataFired_mp4.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: Check that playback only starts once we have data at time = 0</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  el.addEventListener("loadeddata", () => {
+    ok(el.buffered.length, "data is buffered");
+    is(el.buffered.start(0), 0, "must fire loadeddata when data has been loaded");
+    is(el.currentTime, 0, "must fire loadeddata at start");
+  });
+  el.addEventListener("playing", () => {
+    ok(el.buffered.length, "data is buffered");
+    is(el.buffered.start(0), 0, "must fire playing when data has been loaded");
+    ok(el.currentTime >= 0, "must have started playback");
+  });
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  videosb.appendWindowStart = 2;
+  videosb.appendWindowEnd = 4;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // Load [2.4, 3.968344). 2.4 as it's the first keyframe after 2s and
+  // 3.968344 as the last frame ends after 4s.
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // test that appendWindowEnd did its job.
+  ok(el.buffered.start(0) >= 2, "no data can be found prior appendWindowStart");
+  ok(el.buffered.end(el.buffered.length - 1) <= 4, "no data can be found beyond appendWindowEnd");
+  el.play();
+  await once(el, "play");
+  videosb.appendWindowStart = 0;
+  p = once(el, "playing");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
+  await p;
+  ok(true, "playing");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_LoadedMetadataFired.html b/dom/media/mediasource/test/test_LoadedMetadataFired.html
new file mode 100644
index 0000000000..68030dbe2f
--- /dev/null
+++ b/dom/media/mediasource/test/test_LoadedMetadataFired.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append initialization only</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm"), 0, 318));
+  v.play();
+  await once(v, "loadedmetadata");
+  ok(true, "Got loadedmetadata event");
+  is(v.videoWidth, 320, "videoWidth has correct initial value");
+  is(v.videoHeight, 240, "videoHeight has correct initial value");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_LoadedMetadataFired_mp4.html b/dom/media/mediasource/test/test_LoadedMetadataFired_mp4.html
new file mode 100644
index 0000000000..0934907578
--- /dev/null
+++ b/dom/media/mediasource/test/test_LoadedMetadataFired_mp4.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append initialization only</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4"), 0, 1395));
+  v.play();
+  await once(v, "loadedmetadata");
+  ok(true, "Got loadedmetadata event");
+  is(v.videoWidth, 400, "videoWidth has correct initial value");
+  is(v.videoHeight, 300, "videoHeight has correct initial value");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource.html b/dom/media/mediasource/test/test_MediaSource.html
new file mode 100644
index 0000000000..9bdaa0d30b
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource.html
@@ -0,0 +1,92 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  SimpleTest.doesThrow(() => new SourceBuffer, "new SourceBuffer should fail");
+  SimpleTest.doesThrow(() => new SourceBufferList, "new SourceBufferList direct should fail");
+
+  ok(ms instanceof EventTarget, "MediaSource must be an EventTarget");
+  is(ms.readyState, "closed", "New MediaSource must be in closed state");
+
+  // Wrapper creation, tests for leaks.
+  SpecialPowers.wrap(ms);
+
+  // Set an expando to force wrapper creation, tests for leaks.
+  ms.foo = null;
+
+  ok(URL.createObjectURL(ms), "Create an objectURL from the MediaSource");
+
+  let loadedmetadataCount = 0;
+  let updatestartCount = 0;
+  let updateendCount = 0;
+  let updateCount = 0;
+
+  ok(MediaSource.isTypeSupported("video/webm; codecs=vp8"), "VP8 MSE is always supported");
+  ok(MediaSource.isTypeSupported("audio/webm"), "Audio MSE is always supported");
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  is(ms.readyState, "open", "MediaSource must be in open state after sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+  ok(sb, "Create a SourceBuffer");
+  is(ms.sourceBuffers.length, 1, "MediaSource.sourceBuffers is expected length");
+  is(ms.sourceBuffers[0], sb, "SourceBuffer in list matches our SourceBuffer");
+  is(ms.activeSourceBuffers.length, 0, "MediaSource.activeSourceBuffers is expected length");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm")));
+  is(sb.updating, true, "SourceBuffer.updating is expected value after appendBuffer");
+
+  sb.addEventListener("update", () => {
+    is(sb.updating, false, "SourceBuffer.updating is expected value in update event");
+    updateCount++;
+    /* Ensure that we endOfStream on the first update event only as endOfStream can
+       raise more if the duration of the last buffered range and the intial duration
+       differ. See bug 1065207 */
+    if (updateCount == 1) {
+      ms.endOfStream();
+    }
+  });
+
+  sb.addEventListener("updatestart", () => updatestartCount++);
+
+  sb.addEventListener("updateend", () => {
+    is(ms.activeSourceBuffers[0], sb, "SourceBuffer in active list matches our SourceBuffer");
+    is(sb.updating, false, "SourceBuffer.updating is expected value in updateend event");
+    updateendCount++;
+    v.play();
+  });
+
+  ms.addEventListener("sourceended", () => {
+    ok(true, "Receive a sourceended event");
+    is(ms.readyState, "ended", "MediaSource must be in ended state after sourceended");
+  });
+
+  v.addEventListener("loadedmetadata", () => loadedmetadataCount++);
+
+  await once(v, "ended");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  ok(Math.abs(v.currentTime - 4) <= 0.002, "Video has played to end");
+  // XXX: 2 update events can be received dueto duration differences, see bug 1065207.
+  ok(updateCount == 1 || updateCount == 2, "update event received");
+  ok(updateendCount == 1 || updateendCount == 2, "updateend event received");
+  ok(updatestartCount == 1 || updatestartCount == 2, "updatestart event received");
+  is(loadedmetadataCount, 1, "loadedmetadata event received");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource_capture_gc.html b/dom/media/mediasource/test/test_MediaSource_capture_gc.html
new file mode 100644
index 0000000000..d986a6f9ac
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource_capture_gc.html
@@ -0,0 +1,72 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test garbage collection of captured stream, when playing a MediaSource</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="mediasource.js"></script>
+</head>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+function forceGC() {
+  SpecialPowers.gc();
+  SpecialPowers.forceGC();
+  SpecialPowers.forceCC();
+}
+
+SimpleTest.waitForExplicitFinish();
+
+window.onload = async function() {
+// Create an infinite source using a MediaSource
+let el = document.createElement("audio");
+const ms = new MediaSource();
+el.src = URL.createObjectURL(ms);
+await once(ms, "sourceopen");
+const sb = ms.addSourceBuffer("video/mp4");
+await fetchAndLoad(sb, "bipbop/bipbop_audio", ["init"], ".mp4");
+await fetchAndLoad(sb, "bipbop/bipbop_audio", range(1, 11), ".m4s");
+setInterval(async function() {
+  sb.timestampOffset =  sb.buffered.end(sb.buffered.length - 1);
+  await fetchAndLoad(sb, "bipbop/bipbop_audio", range(1, 11), ".m4s");
+}, 8000);
+el.play();
+
+// Analyze the media element output.
+const ac = new AudioContext;
+const analyzer = ac.createAnalyser();
+
+// bug 1703603
+const stream = el.mozCaptureStreamUntilEnded();
+const mss = ac.createMediaStreamSource(stream);
+const gain = ac.createGain();
+// compensate mochitest volume scaling, but don't connect to the AudioContext's
+// destination to avoid noise during the test
+gain.gain.value = 90;
+mss.connect(gain).connect(analyzer);
+
+
+// Drop the media element reference: it is supposed to be kept alive by the
+// AudioContext via the `MediaStream`.
+el = null;
+
+// check whether the media element is still playing using the analyzer, spam the
+// GC to ensure all refs are kept.
+const buf = new Float32Array(analyzer.frequencyBinCount);
+const startTime = Date.now();
+function checkNonSilent() {
+  analyzer.getFloatFrequencyData(buf);
+  forceGC();
+  // Wait a good 20 seconds.
+  if (Date.now() - startTime < 2000) {
+    requestAnimationFrame(checkNonSilent);
+  } else {
+    ok(true, "All objects were kept alive.");
+    SimpleTest.finish();
+  }
+}
+checkNonSilent();
+}
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource_disabled.html b/dom/media/mediasource/test/test_MediaSource_disabled.html
new file mode 100644
index 0000000000..e14f493e0f
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource_disabled.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: disabling via pref</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function test() {
+  ok(!window.MediaSource && !window.SourceBuffer && !window.SourceBufferList,
+     "MediaSource should be hidden behind a pref");
+  SimpleTest.doesThrow(() => new MediaSource,
+                       "MediaSource should be hidden behind a pref");
+  SimpleTest.finish();
+}
+
+SpecialPowers.pushPrefEnv({"set":
+    [
+      ["media.mediasource.enabled", false],
+    ],
+}, test);
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource_flac_mp4.html b/dom/media/mediasource/test/test_MediaSource_flac_mp4.html
new file mode 100644
index 0000000000..9cc159e467
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource_flac_mp4.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Can seek to last frame</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  is(ms.readyState, "open", "MediaSource must be in open state after sourceopen");
+  const sb = ms.addSourceBuffer("audio/mp4; codecs=\"flac\"");
+  ok(sb, "Create a SourceBuffer");
+
+  await fetchAndLoad(sb, "flac/IS", [""], ".mp4");
+  await fetchAndLoad(sb, "flac/0000", range(1, 3), ".m4s");
+  el.play();
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource_memory_reporting.html b/dom/media/mediasource/test/test_MediaSource_memory_reporting.html
new file mode 100644
index 0000000000..70c720effd
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource_memory_reporting.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: memory reporting</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  // Load a webm video and play it.
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+  await fetchAndLoad(sb, "seek", [""], ".webm");
+  const p = once(v, "ended");
+  ms.endOfStream();
+  v.play();
+  await p;
+
+  // Test that memory reporting works once we've played a video.
+  // Grab a memory report.
+  const mgr = SpecialPowers.Cc["@mozilla.org/memory-reporter-manager;1"]
+      .getService(SpecialPowers.Ci.nsIMemoryReporterManager);
+
+  let amount;
+  const handleReport = (aProcess, aPath, aKind, aUnits, aAmount) => {
+    if (aPath == "explicit/media/resources") {
+      amount = (amount || 0) + aAmount;
+    }
+  };
+
+  await new Promise(r => mgr.getReports(handleReport, null, r, null, /* anonymized = */ false));
+  ok(true, "Yay didn't crash!");
+  ok(amount !== undefined, "Got media resources amount");
+  ok(amount > 0, "Non-zero amount reported for media resources");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MediaSource_mp4.html b/dom/media/mediasource/test/test_MediaSource_mp4.html
new file mode 100644
index 0000000000..2ab79f37f3
--- /dev/null
+++ b/dom/media/mediasource/test/test_MediaSource_mp4.html
@@ -0,0 +1,90 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  SimpleTest.doesThrow(() => new SourceBuffer, "new SourceBuffer should fail");
+  SimpleTest.doesThrow(() => new SourceBufferList, "new SourceBufferList direct should fail");
+
+  ok(ms instanceof EventTarget, "MediaSource must be an EventTarget");
+  is(ms.readyState, "closed", "New MediaSource must be in closed state");
+
+  // Wrapper creation, tests for leaks.
+  SpecialPowers.wrap(ms);
+
+  // Set an expando to force wrapper creation, tests for leaks.
+  ms.foo = null;
+
+  ok(URL.createObjectURL(ms), "Create an objectURL from the MediaSource");
+
+  let loadedmetadataCount = 0;
+  let updatestartCount = 0;
+  let updateendCount = 0;
+  let updateCount = 0;
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  is(ms.readyState, "open", "MediaSource must be in open state after sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+  is(ms.sourceBuffers.length, 1, "MediaSource.sourceBuffers is expected length");
+  is(ms.sourceBuffers[0], sb, "SourceBuffer in list matches our SourceBuffer");
+  is(ms.activeSourceBuffers.length, 0, "MediaSource.activeSourceBuffers is expected length");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+  is(sb.updating, true, "SourceBuffer.updating is expected value after appendBuffer");
+
+  sb.addEventListener("update", () => {
+    is(sb.updating, false, "SourceBuffer.updating is expected value in update event");
+    updateCount++;
+    /* Ensure that we endOfStream on the first update event only as endOfStream can
+       raise more if the duration of the last buffered range and the intial duration
+       differ. See bug 1065207 */
+    if (updateCount == 1) {
+      ms.endOfStream();
+    }
+  });
+
+  sb.addEventListener("updatestart", () => updatestartCount++);
+
+  sb.addEventListener("updateend", () => {
+    is(ms.activeSourceBuffers[0], sb, "SourceBuffer in active list matches our SourceBuffer");
+    is(sb.updating, false, "SourceBuffer.updating is expected value in updateend event");
+    updateendCount++;
+    v.play();
+  });
+
+  ms.addEventListener("sourceended", () => {
+    ok(true, "Receive a sourceended event");
+    is(ms.readyState, "ended", "MediaSource must be in ended state after sourceended");
+  });
+
+  v.addEventListener("loadedmetadata", () => loadedmetadataCount++);
+
+  await once(v, "ended");
+  // The bipbop video doesn't start at 0. The old MSE code adjust the
+  // timestamps and ignore the audio track. The new one doesn't.
+  isfuzzy(v.duration, 1.696, 0.166, "Video has correct duration");
+  isfuzzy(v.currentTime, 1.696, 0.166, "Video has correct duration");
+  // XXX: 2 update events can be received dueto duration differences, see bug 1065207.
+  ok(updateCount == 1 || updateCount == 2, "update event received");
+  ok(updateendCount == 1 || updateendCount == 2, "updateend event received");
+  ok(updatestartCount == 1 || updatestartCount == 2, "updatestart event received");
+  is(loadedmetadataCount, 1, "loadedmetadata event received");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MultipleInitSegments.html b/dom/media/mediasource/test/test_MultipleInitSegments.html
new file mode 100644
index 0000000000..f4c91c08c5
--- /dev/null
+++ b/dom/media/mediasource/test/test_MultipleInitSegments.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Append buffer with multiple init segments</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+  const seek_lowres = await fetchWithXHR("seek_lowres.webm");
+  const seek = await fetchWithXHR("seek.webm");
+  const data = [
+    [seek_lowres, 0, 438],     // lowres init segment
+    [seek_lowres, 438, 25950], // lowres media segment 0-1
+    [seek, 0, 318],            // init segment
+    [seek, 46712, 67833],       // media segment 0.8-1.201
+  ];
+  const length = data.map(d => d[2] - d[1]).reduce((a, b) => a + b, 0);
+  const arrayBuffer = new Uint8Array(length);
+  let pos = 0;
+  for (const d of data) {
+    const buffer = new Uint8Array(d[0], d[1], d[2] - d[1]);
+    arrayBuffer.set(buffer, pos);
+    pos += buffer.byteLength;
+  }
+  await loadSegment(sb, arrayBuffer);
+  // Since we are passing multiple segments in one buffer,
+  // the first durationchange event from parsing the init
+  // segment will be fired before updateend.
+  const p = once(v, "durationchange");
+  ms.endOfStream();
+  await p;
+  ok(v.duration, 1.201);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html b/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html
new file mode 100644
index 0000000000..47c115677d
--- /dev/null
+++ b/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Append buffer with multiple init segments</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+  const init = new Uint8Array(await fetchWithXHR("bipbop/bipbop_videoinit.mp4"));
+  const segment1 = new Uint8Array(await fetchWithXHR("bipbop/bipbop_video1.m4s"));
+  const segment2 = new Uint8Array(await fetchWithXHR("bipbop/bipbop_video2.m4s"));
+  const data = [init, segment1, init, segment2];
+  const length = data.map(d => d.byteLength).reduce((a, b) => a + b, 0);
+  const arrayBuffer = new Uint8Array(length);
+  let pos = 0;
+  for (const buffer of data) {
+    arrayBuffer.set(buffer, pos);
+    pos += buffer.byteLength;
+  }
+  await loadSegment(sb, arrayBuffer);
+  // Since we are passing multiple segments in one buffer,
+  // the first durationchange event from parsing the init
+  // segment will be fired before updateend.
+  const p = once(v, "durationchange");
+  ms.endOfStream();
+  await p;
+  ok(v.duration, 1.601666);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_OnEvents.html b/dom/media/mediasource/test/test_OnEvents.html
new file mode 100644
index 0000000000..ae0f348ebe
--- /dev/null
+++ b/dom/media/mediasource/test/test_OnEvents.html
@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: live seekable range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  const receiveEvent = e => v["got" + e] = true;
+
+  const msevents = ["onsourceopen", "onsourceended"];
+  msevents.forEach(e => ms[e] = () => receiveEvent(e));
+
+  const sblistevents = ["onaddsourcebuffer", "onremovesourcebuffer"];
+  sblistevents.forEach(e => ms.sourceBuffers[e] = () => receiveEvent(e));
+
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const sbevents = ["onupdatestart", "onupdate", "onupdateend", "onabort"];
+  sbevents.forEach(e => sb[e] = () => receiveEvent(e));
+
+  await fetchAndLoad(sb, "seek", [""], ".webm");
+  sb.appendBuffer(await fetchWithXHR("seek.webm"));
+  ms.removeSourceBuffer(sb); // will fire abort and removesourcebuffer
+  ms.endOfStream(); // will fire sourceended
+  await once(ms, "sourceended");
+  [...msevents, ...sbevents, ...sblistevents].forEach(e => ok(v["got" + e], "got " + e));
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_PlayEvents.html b/dom/media/mediasource/test/test_PlayEvents.html
new file mode 100644
index 0000000000..82ccaa42b5
--- /dev/null
+++ b/dom/media/mediasource/test/test_PlayEvents.html
@@ -0,0 +1,115 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks that readyState is properly set and the appropriate events are being fired accordingly:
+// 1. Load 1.6s of data and ensure that canplay event is fired.
+// 2. Load data to have a complete buffered range from 0 to duration and ensure that canplaythrough is fired.
+// 3. Seek to an area with no buffered data, and ensure that readyState goes back to HAVE_METADATA
+// 4. Load 1.6s of data at the seek position and ensure that canplay is fired and that readyState is now HAVE_FUTURE_DATA
+// 5. Start playing video and check that once it reaches a position with no data, readyState goes back to HAVE_CURRENT_DATA and waiting event is fired.
+// 6. Add 1.6s of data once video element fired waiting, that canplay is fired once readyState is HAVE_FUTURE_DATA.
+// 7. Finally load data to the end and ensure that canplaythrough is fired and that readyState is now HAVE_ENOUGH_DATA
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  logEvents(el);
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  ok(true, "got loadedmetadata event");
+  p = Promise.all([once(el, "loadeddata"), once(el, "canplay")]);
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 3), ".m4s");
+  await p;
+  ok(true, "got canplay event");
+  // set element duration to 3.203333s. We do so in order to guarantee that
+  // the end of the buffered range will be equal to duration, causing
+  // canplaythrough to be fired later.
+  ms.duration = 3.203333;
+  await once(el, "durationchange");
+  ok(true, "got durationchange event");
+  // Load [0.801666, 3.203333]
+  p = once(el, "canplaythrough");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(3, 5), ".m4s");
+  await p;
+  ok(true, "got canplaythrough event");
+  // set element duration to 9.203333s, this value is set to coincide with
+  // data added later (we now have an empty range from 6s to 9.203333s).
+  ms.duration = 9.203333;
+  await once(el, "durationchange");
+  ok(true, "got durationchange event");
+  // An arbitrary value, so we are guaranteed to be in a range with no data.
+  el.currentTime = 6;
+  videosb.timestampOffset = 6;
+  ok(el.seeking, "seeking started");
+  await once(el, "seeking");
+  ok(true, "got seeking event");
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // Load [6+0, 6+1.601666)
+  p = Promise.all([once(el, "seeked"), once(el, "canplay")]);
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 3), ".m4s");
+  await p;
+  ok(true, "got seeked and canplay event");
+  is(el.currentTime, 6, "seeked to 6s");
+  is(el.readyState, el.HAVE_FUTURE_DATA, "readyState is HAVE_FUTURE_DATA");
+  // Load [6+1.60166, 6+3.203333]
+  p = once(el, "canplaythrough");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(3, 5), ".m4s");
+  await p;
+  ok(true, "got canplaythrough event");
+  // set element duration to 19.805s, this value is set to coincide with
+  // data added later (we now have an empty range from 15 to 19.805).
+  ms.duration = 19.805;
+  await once(el, "durationchange");
+  ok(true, "got durationchange event");
+  el.currentTime = 15;
+  videosb.timestampOffset = 15;
+  ok(el.seeking, "seeking started");
+  await once(el, "seeking");
+  ok(true, "got seeking event");
+  // Load [15+0, 15+1.601666)
+  p = once(el, "seeked");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 3), ".m4s");
+  await p;
+  ok(true, "got seeked event");
+  // Load [15+1.60166, 15+3.203333]
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(3, 5), ".m4s");
+  ok(true, "data loaded");
+  // Playback we play for a little while then stall.
+  p = Promise.all([once(el, "playing"), once(el, "waiting")]);
+  el.play();
+  await p;
+  ok(true, "got playing and waiting event");
+  // Playback has stalled, readyState is back to HAVE_CURRENT_DATA.
+  is(el.readyState, el.HAVE_CURRENT_DATA, "readyState is HAVE_CURRENT_DATA");
+  // Load [15+3.203333, 15+4.805)
+  // Our final buffered range will now be [0, 3.203333)[6, 9.203333)[15, 19.805)
+  p = Promise.all([once(el, "playing"), once(el, "canplay"), once(el, "canplaythrough")]);
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 7), ".m4s");
+  await p;
+  ok(true, "got playing, canplay and canplaythrough event");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_PlayEventsAutoPlaying.html b/dom/media/mediasource/test/test_PlayEventsAutoPlaying.html
new file mode 100644
index 0000000000..3e395c799d
--- /dev/null
+++ b/dom/media/mediasource/test/test_PlayEventsAutoPlaying.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks that readyState is properly set and the appropriate events are being fired accordingly:
+// 1. Ensure that play/playing aren't fired before any media data been added.
+// 2. Load 1.6s of data and ensure that canplay, play and playing events are fired.
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  el.autoplay = true;
+  const eventCounts = { play: 0, playing: 0 };
+  await once(ms, "sourceopen");
+  logEvents(el);
+  ok(true, "Receive a sourceopen event");
+
+  const forbiddenEvents = e => {
+    ok(el.readyState >= el.HAVE_FUTURE_DATA, "Must not have received event too early");
+    is(eventCounts[e.type], 0, "event should have only be fired once");
+    eventCounts[e.type]++;
+  };
+  el.addEventListener("play", forbiddenEvents);
+  el.addEventListener("playing", forbiddenEvents);
+
+  const videosb = ms.addSourceBuffer("video/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  ok(true, "got loadedmetadata event");
+  // We're only adding 1.6s worth of data, not enough for readyState to change to HAVE_ENOUGH_DATA
+  // So we end the media source so that all the playable data is available.
+  p = Promise.all(["loadeddata", "canplay", "play", "playing", "ended"].map(e => once(el, e)));
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 3), ".m4s");
+  ms.endOfStream();
+  await p;
+  ok(true, "got all required event");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_PlayEventsAutoPlaying2.html b/dom/media/mediasource/test/test_PlayEventsAutoPlaying2.html
new file mode 100644
index 0000000000..8845a26ac4
--- /dev/null
+++ b/dom/media/mediasource/test/test_PlayEventsAutoPlaying2.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks that readyState is properly set and the appropriate events are being fired accordingly:
+// 1. Ensure that play/playing aren't fired before any media data been added.
+// 2. Load more than 10s of data and ensure that canplay, play and playing events are fired.
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  el.autoplay = true;
+  const eventCounts = { play: 0, playing: 0 };
+  await once(ms, "sourceopen");
+  logEvents(el);
+  ok(true, "Receive a sourceopen event");
+
+  const forbiddenEvents = e => {
+    ok(el.readyState >= el.HAVE_FUTURE_DATA, "Must not have received event too early");
+    is(eventCounts[e.type], 0, "event should have only be fired once");
+    eventCounts[e.type]++;
+  };
+  el.addEventListener("play", forbiddenEvents);
+  el.addEventListener("playing", forbiddenEvents);
+
+  const videosb = ms.addSourceBuffer("video/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  ok(true, "got loadedmetadata event");
+  // We shift the timestamps slightly to create a small gaps at the start.
+  // one that should normally be ignored.
+  videosb.timestampOffset = 0.1;
+  p = Promise.all(["loadeddata", "canplay", "play", "playing"].map(e => once(el, e)));
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 14), ".m4s");
+  await p;
+  ok(true, "got all required event");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_RemoveSourceBuffer.html b/dom/media/mediasource/test/test_RemoveSourceBuffer.html
new file mode 100644
index 0000000000..11c6a51deb
--- /dev/null
+++ b/dom/media/mediasource/test/test_RemoveSourceBuffer.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: check buffered status after removed all source buffer</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+const videoURL = "seek.webm";
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async function(ms, el) {
+  info("- wait for sourceopen -");
+  await once(ms, "sourceopen");
+
+  info("- wait for fetching data -");
+  const arrayBuffer = await fetchWithXHR(videoURL);
+
+  info("- create source buffer and append data -");
+  const sourceBuffer = ms.addSourceBuffer("video/webm");
+  sourceBuffer.appendBuffer(arrayBuffer);
+  await once(sourceBuffer, "updateend");
+  is(ms.sourceBuffers.length, 1,
+     "the length of source buffers list is 1.");
+  is(ms.activeSourceBuffers.length, 1,
+     "the length of active source buffers list is 1.");
+  ok(ms.duration != 0, "duration is not 0.");
+  is(el.buffered.length, 1, "buffered range is 1.");
+
+  info("- remove source buffer from media source -");
+  ms.removeSourceBuffer(sourceBuffer);
+  await once(ms.sourceBuffers, "removesourcebuffer");
+  is(ms.sourceBuffers.length, 0, "source buffers list is empty.");
+  is(ms.activeSourceBuffers.length, 0, "active source buffers list is empty.");
+  ok(ms.duration != 0, "duration is not 0.");
+  is(el.buffered.length, 0,
+     "buffered range is empty since we don't have any source buffer.");
+
+  info("- call endOfStream -");
+  ms.endOfStream();
+  is(ms.duration, 0, "duraton is 0 since we don't have any source buffer.");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_Resolution_change_should_not_cause_video_freeze.html b/dom/media/mediasource/test/test_Resolution_change_should_not_cause_video_freeze.html
new file mode 100644
index 0000000000..640b53441e
--- /dev/null
+++ b/dom/media/mediasource/test/test_Resolution_change_should_not_cause_video_freeze.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: video resolution changes during playback should not cause video freeze (Bug 1718709)</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer('video/mp4');
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bug1718709_low_res.mp4")));
+  ok(true, "appended low resolution video");
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bug1718709_high_res.mp4")));
+  ok(true, "appended high resolution video");
+
+  info(`start from the position which is near to the place where resolution changes`);
+  v.currentTime = 13;
+  ok(await v.play().then(_=>true,_=>false), "video started playing");
+
+  // When video resolution changes, it should not cause video freeze so we check
+  // its painted frame amount regularly to see if we stop updating video frames.
+  let lastPaintedFramesAmount = v.mozPaintedFrames;
+  const intervalHandle = setInterval(_=>{
+    ok(lastPaintedFramesAmount < v.mozPaintedFrames,
+       `painted frames keeps growing from ${lastPaintedFramesAmount} to ${v.mozPaintedFrames}`);
+    lastPaintedFramesAmount = v.mozPaintedFrames;
+  }, 1000);
+
+  // As we didn't append full video, so we will receive `waiting` event later
+  // which indicates that we can stop testing because we've finished playing
+  // the high resolution part.
+  await new Promise(r => {
+    v.onwaiting = _ => {
+      clearInterval(intervalHandle);
+      r();
+    }
+  });
+  SimpleTest.finish();
+});
+
+</script>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_ResumeAfterClearing_mp4.html b/dom/media/mediasource/test/test_ResumeAfterClearing_mp4.html
new file mode 100644
index 0000000000..40e512ba12
--- /dev/null
+++ b/dom/media/mediasource/test/test_ResumeAfterClearing_mp4.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Don't get stuck buffering for too long when we have frames to show</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  ms.addEventListener("sourceopen", () => ok(false, "No more sourceopen"));
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  await fetchAndLoad(sb, "bipbop/bipbop", ["init"], ".mp4");
+  let p = once(v, "loadeddata");
+  await fetchAndLoad(sb, "bipbop/bipbop", range(1, 3), ".m4s");
+  await p;
+  // clear the entire sourcebuffer.
+  sb.remove(0, 5);
+  await once(sb, "updateend");
+  v.play();
+  // We have nothing to play, waiting will be fired.
+  await once(v, "waiting");
+  p = once(v, "playing");
+  await fetchAndLoad(sb, "bipbop/bipbop", range(1, 4), ".m4s");
+  await p;
+  ms.endOfStream();
+  await Promise.all([once(ms, "sourceended"), once(v, "ended")]);
+  SimpleTest.finish(SimpleTest);
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekNoData_mp4.html b/dom/media/mediasource/test/test_SeekNoData_mp4.html
new file mode 100644
index 0000000000..1ea64f3fa4
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekNoData_mp4.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  must_not_throw(() => el.currentTime = 3, "setting currentTime is valid");
+  is(el.currentTime, 3, "currentTime is default playback start position");
+  is(el.seeking, false, "seek not started with HAVE_NOTHING");
+  await Promise.all([
+    fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4"),
+    fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4"),
+    once(el, "loadedmetadata"),
+  ]);
+  const p = once(el, "seeking");
+  el.play();
+  el.currentTime = 5;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  is(el.seeking, true, "seek not started with HAVE_METADATA");
+  is(el.currentTime, 5, "currentTime is seek position");
+  await p;
+  ok(true, "Got seeking event");
+  await Promise.all([
+    once(el, "seeked"),
+    fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(5, 9), ".m4s"),
+    fetchAndLoad(videosb, "bipbop/bipbop_video", range(6, 10), ".m4s"),
+  ]);
+  ok(true, "Got seeked event");
+  ok(el.currentTime >= 5, "Time >= 5");
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekToEnd_mp4.html b/dom/media/mediasource/test/test_SeekToEnd_mp4.html
new file mode 100644
index 0000000000..0405cb875f
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekToEnd_mp4.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seeking to end of data with data gap.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 6), ".m4s");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  is(videosb.buffered.length, 1, "continuous buffered range");
+  // Ensure we have at least 2s less audio than video.
+  audiosb.appendWindowEnd = videosb.buffered.end(0) - 2;
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 6), ".m4s");
+  ms.endOfStream();
+  await Promise.all([once(el, "durationchange"), once(ms, "sourceended")]);
+  ok(true, "endOfStream completed");
+  // Seek to the middle of the gap where audio is missing. As we are in readyState = ended
+  // seeking must complete.
+  el.currentTime = videosb.buffered.end(0) / 2 + audiosb.buffered.end(0) / 2;
+  ok(el.currentTime - audiosb.buffered.end(0) >= 1, "gap is big enough");
+  is(el.buffered.length, 1, "continuous buffered range");
+  is(el.buffered.end(0), videosb.buffered.end(0),
+     "buffered range end is aligned with longest track");
+  ok(el.seeking, "element is now seeking");
+  ok(el.currentTime >= el.buffered.start(0) && el.currentTime <= el.buffered.end(0),
+     "seeking time is in buffered range");
+  ok(el.currentTime > audiosb.buffered.end(0),
+     "seeking point is not buffered in audio track");
+  await once(el, "seeked");
+  ok(true, "we have successfully seeked");
+  // Now ensure that we can play to the end, even though we are missing data in one track.
+  el.play();
+  await once(el, "ended");
+  SimpleTest.finish(SimpleTest);
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekToLastFrame_mp4.html b/dom/media/mediasource/test/test_SeekToLastFrame_mp4.html
new file mode 100644
index 0000000000..edbfdff0a0
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekToLastFrame_mp4.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Can seek to last frame</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const sb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", ["init"], ".mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_480_624kbps-video", range(1, 3), ".m4s");
+  el.play();
+  // let seek to the last audio frame.
+  el.currentTime = 1.532517;
+  await once(el, "seeked");
+  ok(true, "seek completed");
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekTwice_mp4.html b/dom/media/mediasource/test/test_SeekTwice_mp4.html
new file mode 100644
index 0000000000..50ff32b1cd
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekTwice_mp4.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 5), ".m4s");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(6, 12), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 6), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(7, 14), ".m4s");
+  let p = once(el, "seeking");
+  el.play();
+  el.currentTime = 4.5; // Seek to a gap in the video
+  await p;
+  ok(true, "Got seeking event");
+  p = once(el, "seeked");
+  el.currentTime = 6; // Seek past the gap.
+  await p;
+  ok(true, "Got seeked event");
+  ok(el.currentTime >= 6, "Time >= 6");
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream.html b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream.html
new file mode 100644
index 0000000000..c65a4aff7e
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute after end of stream</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  info("- append first buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- check seekable -");
+  const target = 2;
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check seekable -");
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit.html b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit.html
new file mode 100644
index 0000000000..bed2af8d48
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute after end of stream with split appendBuffer</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  info("- append first buffer -");
+  // 25523 is the offset of the first media segment's end
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 25523));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- append second buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 25523));
+  await once(sb, "updateend");
+
+  info("- check seekable -");
+  const target = 2;
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check seekable -");
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html
new file mode 100644
index 0000000000..00b5f9a832
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute after end of stream with split appendBuffer</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  info("- append first buffer -");
+  // 25819 is the offset of the first media segment's end
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 25819));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- append second buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 25819));
+  await once(sb, "updateend");
+
+  info("- check seekable -");
+  const target = 1.3;
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check seekable -");
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream_mp4.html b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream_mp4.html
new file mode 100644
index 0000000000..c8e53833fb
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStream_mp4.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute after end of stream</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  info("- append buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- check seekable -");
+  const target = 1.3;
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check seekable -");
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SeekedEvent_mp4.html b/dom/media/mediasource/test/test_SeekedEvent_mp4.html
new file mode 100644
index 0000000000..70401f1eb1
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekedEvent_mp4.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: Check that seeked event is fired prior loadeddata</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  const events = ["seeked", "loadeddata", "playing"];
+  let eventCount = 0;
+  events.forEach(type => el.addEventListener(type,
+      () => is(events[eventCount++], type, "events must come in order")));
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  el.play();
+  videosb.timestampOffset = 2;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // Load [2, 3.606).
+  p = once(el, "play");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["1"], ".m4s");
+  await p;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["2"], ".m4s");
+  // TODO: readyState should be at least HAVE_CURRENTDATA, see bug 1367993.
+  ok(el.readyState >= el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  el.currentTime = 2;
+  await Promise.all([once(el, "seeked"), once(el, "playing")]);
+  ok(true, "completed seek");
+  is(eventCount, events.length, "Received expected number of events");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_Sequence_mp4.html b/dom/media/mediasource/test/test_Sequence_mp4.html
new file mode 100644
index 0000000000..2b56cb8bcc
--- /dev/null
+++ b/dom/media/mediasource/test/test_Sequence_mp4.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Don't get stuck buffering for too long when we have frames to show</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  ms.addEventListener("sourceopen", () => ok(false, "No more sourceopen"));
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  sb.mode = "sequence";
+
+  await fetchAndLoad(sb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_video", ["5"], ".m4s");
+  await fetchAndLoad(sb, "bipbop/bipbop_video", ["2"], ".m4s");
+  is(v.buffered.length, 1, "Continuous buffered range");
+  is(v.buffered.start(0), 0, "Buffered range starts at 0");
+  ok(sb.timestampOffset > 0, "SourceBuffer.timestampOffset set to allow continuous range");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SetModeThrows.html b/dom/media/mediasource/test/test_SetModeThrows.html
new file mode 100644
index 0000000000..c715854b41
--- /dev/null
+++ b/dom/media/mediasource/test/test_SetModeThrows.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append initialization</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// MSE supports setting mode now. make sure it does not throw.
+runWithMSE(function(ms, v) {
+  ms.addEventListener("sourceopen", () => {
+    const sb = ms.addSourceBuffer("video/webm");
+
+    sb.mode = "segments";
+    ok("true", "Setting to segments does not throw");
+    try {
+      sb.mode = "sequence";
+      ok("true", "Setting to sequence does not throw");
+    } catch (e) { ok(false, "Should not throw setting mode to sequence: " + e); }
+
+    SimpleTest.finish();
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SplitAppend.html b/dom/media/mediasource/test/test_SplitAppend.html
new file mode 100644
index 0000000000..a4be5de282
--- /dev/null
+++ b/dom/media/mediasource/test/test_SplitAppend.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append initialization and media segment separately</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+  v.play();
+  await once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(v, "ended");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  ok(Math.abs(v.currentTime - 4) <= 0.002, "Video has played to end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SplitAppendDelay.html b/dom/media/mediasource/test/test_SplitAppendDelay.html
new file mode 100644
index 0000000000..40183c3db0
--- /dev/null
+++ b/dom/media/mediasource/test/test_SplitAppendDelay.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append segments with delay</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+  v.play();
+  await once(sb, "updateend");
+  await wait(1000);
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(v, "ended");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  ok(Math.abs(v.currentTime - 4) <= 0.002, "Video has played to end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SplitAppendDelay_mp4.html b/dom/media/mediasource/test/test_SplitAppendDelay_mp4.html
new file mode 100644
index 0000000000..c072a526cf
--- /dev/null
+++ b/dom/media/mediasource/test/test_SplitAppendDelay_mp4.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append segments with delay</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 1395));
+  v.play();
+  await once(sb, "updateend");
+  await wait(1000);
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 1395));
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(v, "ended");
+  // The bipbop video doesn't start at 0. The old MSE code adjust the
+  // timestamps and ignore the audio track. The new one doesn't.
+  isfuzzy(v.duration, 1.696, 0.166, "Video has correct duration");
+  isfuzzy(v.currentTime, 1.696, 0.166, "Video has played to end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_SplitAppend_mp4.html b/dom/media/mediasource/test/test_SplitAppend_mp4.html
new file mode 100644
index 0000000000..308fa9837d
--- /dev/null
+++ b/dom/media/mediasource/test/test_SplitAppend_mp4.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append initialization and media segment separately</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 1395));
+  v.play();
+  await once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 1395));
+  await once(sb, "updateend");
+  ms.endOfStream();
+
+  await once(v, "ended");
+  // The bipbop video doesn't start at 0. The old MSE code adjust the
+  // timestamps and ignore the audio track. The new one doesn't.
+  isfuzzy(v.duration, 1.696, 0.166, "Video has correct duration");
+  isfuzzy(v.currentTime, 1.696, 0.166, "Video has played to end");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_Threshold_mp4.html b/dom/media/mediasource/test/test_Threshold_mp4.html
new file mode 100644
index 0000000000..c46883c93d
--- /dev/null
+++ b/dom/media/mediasource/test/test_Threshold_mp4.html
@@ -0,0 +1,73 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: data gap detection</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  const threshold = 0.5; // gap threshold in seconds.
+  const fuzz = 0.000001; // fuzz when comparing double.
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  const vchunks = [{start: 0, end: 3.203333}, { start: 3.203333, end: 6.406666}];
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  // We will insert a gap of threshold
+  videosb.timestampOffset = threshold;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  // HTMLMediaElement fires 'waiting' if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get 'playing' before
+  // we starting waiting for 'waiting'.
+  info("Invoking play()");
+  let p = once(el, "playing");
+  el.play();
+  await p;
+  await once(el, "waiting");
+  // We're waiting for data after the start of the last frame.
+  // 0.033333 is the duration of the last frame.
+  ok((el.currentTime >= vchunks[1].end - 0.033333 + threshold - fuzz &&
+      el.currentTime <= vchunks[1].end + threshold + fuzz),
+     `skipped the gap properly: ${el.currentTime} ${vchunks[1].end + threshold}`);
+  is(el.buffered.length, 2, "buffered range has right length");
+  // Now we test that seeking will succeed despite the gap.
+  el.currentTime = el.buffered.end(0) + (threshold / 2);
+  await once(el, "seeked");
+  // Now we test that we don't pass the gap.
+  // Clean up our sourcebuffer by removing all data.
+  videosb.timestampOffset = 0;
+  videosb.remove(0, Infinity);
+  el.currentTime = 0;
+  el.pause();
+  await once(videosb, "updateend");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  // We will insert a gap of threshold + 1ms
+  videosb.timestampOffset = threshold + 1 / 1000;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  info("Invoking play()");
+  p = once(el, "playing");
+  el.play();
+  await p;
+  await once(el, "waiting");
+  // We're waiting for data after the start of the last frame.
+  // 0.033333 is the duration of the last frame.
+  ok((el.currentTime >= vchunks[0].end - 0.033333 - fuzz &&
+      el.currentTime <= vchunks[0].end + fuzz),
+     `stopped at the gap properly: ${el.currentTime} ${vchunks[0].end}`);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_TimestampOffset_mp4.html b/dom/media/mediasource/test/test_TimestampOffset_mp4.html
new file mode 100644
index 0000000000..bd08e0f36e
--- /dev/null
+++ b/dom/media/mediasource/test/test_TimestampOffset_mp4.html
@@ -0,0 +1,76 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  const eps = 0.01;
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  // We divide the video into 3 chunks:
+  // chunk 0: segments 1-4
+  // chunk 1: segments 5-8
+  // chunk 2: segments 9-13
+  // We then fill the timeline so that it seamlessly plays the chunks in order 0, 2, 1.
+  const vchunks = [{start: 0, end: 3.2033},
+                    { start: 3.2033, end: 6.4066},
+                    { start: 6.4066, end: 10.01}];
+  const firstvoffset = vchunks[2].end - vchunks[2].start; // Duration of chunk 2
+  const secondvoffset = -(vchunks[1].end - vchunks[1].start); // -(Duration of chunk 1)
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  is(videosb.buffered.length, 1, "No discontinuity");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[0].end, eps, "Chunk end");
+  videosb.timestampOffset = firstvoffset;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  is(videosb.buffered.length, 2, "One discontinuity");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "First Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[0].end, eps, "First chunk end");
+  isfuzzy(videosb.buffered.start(1), vchunks[1].start + firstvoffset, eps, "Second chunk start");
+  isfuzzy(videosb.buffered.end(1), vchunks[1].end + firstvoffset, eps, "Second chunk end");
+  videosb.timestampOffset = secondvoffset;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(9, 14), ".m4s");
+  is(videosb.buffered.length, 1, "No discontinuity (end)");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[2].end, eps, "Chunk end");
+  audiosb.timestampOffset = 3;
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 12), ".m4s");
+  is(audiosb.buffered.length, 1, "No audio discontinuity");
+  isfuzzy(audiosb.buffered.start(0), 3, eps, "Audio starts at 3");
+
+  // Trim the rest of the audio.
+  audiosb.remove(videosb.buffered.end(0), Infinity);
+  videosb.remove(videosb.buffered.end(0), Infinity);
+  if (audiosb.updating) {
+    await once(audiosb, "updateend");
+  }
+  if (videosb.updating) {
+    await once(videosb, "updateend");
+  }
+  info("waiting for play to complete");
+  el.play();
+  el.currentTime = el.buffered.start(0);
+  ms.endOfStream();
+  await Promise.all([once(el, "ended"), once(el, "seeked")]);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_TruncatedDuration.html b/dom/media/mediasource/test/test_TruncatedDuration.html
new file mode 100644
index 0000000000..c80e40ac98
--- /dev/null
+++ b/dom/media/mediasource/test/test_TruncatedDuration.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: truncating the media seeks to end of media and update buffered range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// This test append data to a mediasource and then seek to half the duration
+// of the video.
+// We then shorten the video to 1/3rd of its original size by modifying the
+// mediasource.duration attribute.
+// We ensure that the buffered range immediately reflect the truncation
+// and that we've seeked to the new end of the media as per W3C spec and
+// video.currentTime got updated.
+
+SimpleTest.waitForExplicitFinish();
+
+const round = n => Math.round(n * 1000) / 1000;
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("seek.webm")));
+  await once(sb, "updateend");
+  v.currentTime = v.duration / 2;
+  is(v.currentTime, v.duration / 2, "current time was updated");
+  ok(v.seeking, "seeking is true");
+  await once(v, "seeked");
+  const duration = round(v.duration / 3);
+  is(sb.updating, false, "sourcebuffer isn't updating");
+  sb.remove(duration, Infinity);
+  await once(sb, "updateend");
+  ms.duration = duration;
+  // frames aren't truncated, so duration may be slightly more.
+  isfuzzy(v.duration, duration, 1 / 30, "element duration was updated");
+  sb.abort(); // this shouldn't abort updating the duration (bug 1130826).
+  ok(v.seeking, "seeking is true");
+  // test playback position was updated (bug 1130839).
+  is(v.currentTime, v.duration, "current time was updated");
+  is(sb.buffered.length, 1, "One buffered range");
+  // Truncated mediasource duration will cause the video element to seek.
+  await once(v, "seeking");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_TruncatedDuration_mp4.html b/dom/media/mediasource/test/test_TruncatedDuration_mp4.html
new file mode 100644
index 0000000000..2f37150fd3
--- /dev/null
+++ b/dom/media/mediasource/test/test_TruncatedDuration_mp4.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: truncating the media seeks to end of media and update buffered range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// This test append data to a mediasource and then seek to half the duration
+// of the video.
+// We then shorten the video to 1/3rd of its original size.
+// We ensure that the buffered range immediately reflect the truncation
+// and that we've seeked to the new end of the media as per W3C spec and
+// video.currentTime got updated.
+
+SimpleTest.waitForExplicitFinish();
+
+const round = n => Math.round(n * 1000) / 1000;
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+  await once(sb, "updateend");
+  // mp4 metadata states 10s when we only have 1.6s worth of video.
+  sb.remove(sb.buffered.end(0), Infinity);
+  await once(sb, "updateend");
+  ms.duration = sb.buffered.end(0);
+  is(v.duration, ms.duration, "current time updated with mediasource duration");
+  v.currentTime = v.duration / 2;
+  is(v.currentTime, v.duration / 2, "current time was updated");
+  ok(v.seeking, "seeking is true");
+  await once(v, "seeked");
+  const duration = round(v.duration / 3);
+  is(sb.updating, false, "sourcebuffer isn't updating");
+  sb.remove(duration, Infinity);
+  await once(sb, "updateend");
+  ms.duration = duration;
+  // frames aren't truncated, so duration may be slightly more.
+  isfuzzy(v.duration, duration, 1 / 30, "element duration was updated");
+  sb.abort(); // this shouldn't abort updating the duration (bug 1130826).
+  ok(v.seeking, "seeking is true");
+  // test playback position was updated (bug 1130839).
+  is(v.currentTime, v.duration, "current time was updated");
+  is(sb.buffered.length, 1, "One buffered range");
+  // Truncated mediasource duration will cause the video element to seek.
+  await once(v, "seeking");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WMFUnmatchedAudioDataTime.html b/dom/media/mediasource/test/test_WMFUnmatchedAudioDataTime.html
new file mode 100644
index 0000000000..7c03214c7b
--- /dev/null
+++ b/dom/media/mediasource/test/test_WMFUnmatchedAudioDataTime.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: audio output time doesn't match the input time on WMF</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer('audio/mp4;codecs=" mp4a.40.2"');
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("wmf_mismatchedaudiotime.mp4")));
+  ok(true, "appended data");
+
+  info(`if error doesn't occur, we should be able to receive 'seeked', otherwise 'error' would be dispatched`);
+  v.currentTime = 22.05;
+  ok(await Promise.race([
+    once(v, "seeked").then(_ => true),
+    once(v, "error").then(_ => false),
+  ]), "finished seeking without any error");
+  ok(!v.error, "should not get any error");
+  SimpleTest.finish();
+});
+
+</script>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WaitingOnMissingData.html b/dom/media/mediasource/test/test_WaitingOnMissingData.html
new file mode 100644
index 0000000000..b1ad41bb37
--- /dev/null
+++ b/dom/media/mediasource/test/test_WaitingOnMissingData.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const sb = ms.addSourceBuffer("video/webm");
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 0, 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 318, 25223 - 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 25223, 46712 - 25223));
+  /* Note - Missing |46712, 67833 - 46712| segment here */
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 67833, 88966 - 67833));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 88966));
+  // HTMLMediaElement fires "waiting" if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get "playing" before
+  // we starting waiting for "waiting".
+  info("Invoking play()");
+  let p = once(el, "playing");
+  el.play();
+  await p;
+  ok(true, "Video playing. It should play for a bit, then fire 'waiting'");
+  p = once(el, "waiting");
+  el.play();
+  await p;
+  // currentTime is based on the current video frame, so if the audio ends just before
+  // the next video frame, currentTime can be up to 1 frame's worth earlier than
+  // min(audioEnd, videoEnd).
+  // 0.0465 is the length of the last audio frame.
+  ok(el.currentTime >= (sb.buffered.end(0) - 0.0465),
+     `Got a waiting event at ${el.currentTime}`);
+  info("Loading more data");
+  p = once(el, "ended");
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 46712, 67833 - 46712));
+  ms.endOfStream();
+  await p;
+  // These fuzz factors are bigger than they should be. We should investigate
+  // and fix them in bug 1137574.
+  isfuzzy(el.duration, 4.001, 0.1, "Video has correct duration: " + el.duration);
+  isfuzzy(el.currentTime, el.duration, 0.1, "Video has correct currentTime.");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WaitingOnMissingDataEnded_mp4.html b/dom/media/mediasource/test/test_WaitingOnMissingDataEnded_mp4.html
new file mode 100644
index 0000000000..8ca61eae7e
--- /dev/null
+++ b/dom/media/mediasource/test/test_WaitingOnMissingDataEnded_mp4.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  el.addEventListener("ended", () => {
+    ok(false, "ended should never fire");
+    SimpleTest.finish();
+  });
+  const videosb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(6, 8), ".m4s");
+  is(el.buffered.length, 2, "discontinuous buffered range");
+  ms.endOfStream();
+  await Promise.all([once(el, "durationchange"), once(ms, "sourceended")]);
+  // HTMLMediaElement fires "waiting" if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get "playing" before
+  // we starting waiting for "waiting".
+  info("Invoking play()");
+  el.play();
+  await once(el, "playing");
+  ok(true, "Video playing. It should play for a bit, then fire 'waiting'");
+  await once(el, "waiting");
+  // waiting is fired when we start to play the last frame.
+  // 0.033334 is the duration of the last frame, + 0.000001 of fuzz.
+  // the next video frame, currentTime can be up to 1 frame's worth earlier than end of video.
+  isfuzzy(el.currentTime, videosb.buffered.end(0), 0.033334, "waiting was fired on gap");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WaitingOnMissingData_mp4.html b/dom/media/mediasource/test/test_WaitingOnMissingData_mp4.html
new file mode 100644
index 0000000000..f6768754e7
--- /dev/null
+++ b/dom/media/mediasource/test/test_WaitingOnMissingData_mp4.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 5), ".m4s");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(6, 12), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 6), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(7, 14), ".m4s");
+  // HTMLMediaElement fires "waiting" if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get "playing" before
+  // we starting waiting for "waiting".
+  info("Invoking play()");
+  let p = once(el, "playing");
+  el.play();
+  await p;
+  ok(true, "Video playing. It should play for a bit, then fire 'waiting'");
+  p = once(el, "waiting");
+  el.play();
+  await p;
+  // currentTime is based on the current video frame, so if the audio ends just before
+  // the next video frame, currentTime can be up to 1 frame's worth earlier than
+  // min(audioEnd, videoEnd).
+  // 0.0465 is the length of the last audio frame.
+  ok(el.currentTime >= (Math.min(audiosb.buffered.end(0), videosb.buffered.end(0)) - 0.0465),
+     `Got a waiting event at ${el.currentTime}`);
+  info("Loading more data");
+  p = once(el, "ended");
+  await Promise.all([
+    fetchAndLoad(audiosb, "bipbop/bipbop_audio", [5], ".m4s"),
+    fetchAndLoad(videosb, "bipbop/bipbop_video", [6], ".m4s"),
+  ]);
+  ms.endOfStream();
+  await p;
+  // These fuzz factors are bigger than they should be. We should investigate
+  // and fix them in bug 1137574.
+  isfuzzy(el.duration, 10.1, 0.1, "Video has correct duration: " + el.duration);
+  isfuzzy(el.currentTime, el.duration, 0.1, "Video has correct currentTime.");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WaitingToEndedTransition_mp4.html b/dom/media/mediasource/test/test_WaitingToEndedTransition_mp4.html
new file mode 100644
index 0000000000..9c3fc73161
--- /dev/null
+++ b/dom/media/mediasource/test/test_WaitingToEndedTransition_mp4.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  // ensure tracks end at approximately the same time to ensure ended event is
+  // always fired (bug 1233639).
+  audiosb.appendWindowEnd = 3.9;
+  videosb.appendWindowEnd = 3.9;
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 5), ".m4s");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 6), ".m4s");
+  // HTMLMediaElement fires "waiting" if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get "playing" before
+  // we starting waiting for "waiting".
+  info("Invoking play()");
+  let p = once(el, "playing");
+  el.play();
+  await p;
+  ok(true, "Video playing. It should play for a bit, then fire 'waiting'");
+  await once(el, "waiting");
+  p = once(el, "ended");
+  ms.endOfStream();
+  await p;
+  // Following bug 1524890, we now implement fully step 8 of the coded frame
+  // processing algorithm
+  // http://w3c.github.io/media-source/index.html#sourcebuffer-coded-frame-processing
+  // As such, duration is exactly the value of videosb.appendWindowEnd
+  is(el.duration, videosb.appendWindowEnd, "Video has correct duration: " + el.duration);
+  is(el.currentTime, el.duration, "Video has correct currentTime.");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_WebMTagsBeforeCluster.html b/dom/media/mediasource/test/test_WebMTagsBeforeCluster.html
new file mode 100644
index 0000000000..d1d45173cd
--- /dev/null
+++ b/dom/media/mediasource/test/test_WebMTagsBeforeCluster.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: WebM tags element before cluster element</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+addMSEPrefs(["media.mediasource.webm.enabled", true]);
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("tags_before_cluster.webm");
+  info("- append buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check buffered range -");
+  is(sb.buffered.length, 1, "buffered range is not empty.");
+
+  info("- video is playing -");
+  v.play();
+  await once(v, "timeupdate");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/test_trackidchange_mp4.html b/dom/media/mediasource/test/test_trackidchange_mp4.html
new file mode 100644
index 0000000000..fdbeece3cd
--- /dev/null
+++ b/dom/media/mediasource/test/test_trackidchange_mp4.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: test append of audio with similar init segments that have different track ids</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  await fetchAndLoad(audiosb, "init-trackid2", [''], ".mp4");
+  await fetchAndLoad(audiosb, "segment-2.0001", [''], ".m4s");
+  await fetchAndLoad(audiosb, "init-trackid3", [''], ".mp4");
+  await fetchAndLoad(audiosb, "segment-3.0002", [''], ".m4s");
+  is(el.buffered.length, 1, "data is buffered");
+  is(el.buffered.end(0), 8, "all data got appended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/mediasource/test/whitenoise-he-aac-5s.mp4 b/dom/media/mediasource/test/whitenoise-he-aac-5s.mp4
new file mode 100644
index 0000000000..db648b8229
Binary files /dev/null and b/dom/media/mediasource/test/whitenoise-he-aac-5s.mp4 differ
diff --git a/dom/media/mediasource/test/wmf_mismatchedaudiotime.mp4 b/dom/media/mediasource/test/wmf_mismatchedaudiotime.mp4
new file mode 100644
index 0000000000..9e179bd326
Binary files /dev/null and b/dom/media/mediasource/test/wmf_mismatchedaudiotime.mp4 differ
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