[Markdown] Convert Web/Media to Markdown - DO NOT SQUASH MERGE

[wbamberg]

This PR converts https://developer.mozilla.org/en-US/docs/Web/Media to Markdown.

Preparation PR: #9809.

Conversion report summary:

---

All unhandled elements

• tr (676)
• th[scope="row"] (628)
• table.standard-table (103)
• td (77)
• th[scope="col"] (60)
• td[style="vertical-align: top;"] (47)
• th[rowSpan="2"][scope="row"][style="vertical-align: bottom;"] (16)
• th[colSpan="4"][scope="col"][style="text-align: center;"] (15)
• td[style="vertical-align: top; border-right: 2px solid #d4dde4;"] (10)
• th[scope="row"][style="vertical-align: top;"] (7)
• th[rowSpan="2"][scope="row"] (4)
• th[scope="col"][style="vertical-align: bottom;"] (4)
• table.standard-table[style="max-width: 42rem;"] (4)
• td[rowSpan="2"][style="vertical-align: top;"] (3)
• th[scope="col"][style="width: 216px;"] (3)
• table.standard-table[style="margin-left: 4em; max-width: 30em;"] (2)
• th[scope="col"][style="vertical-align: bottom; border-right: 2px solid #d4dde4;"] (2)
• th[colSpan="3"][scope="col"][style="text-align: center; border-right: 2px solid #d4dde4;"] (1)
• th[colSpan="3"][scope="col"][style="text-align: center;"] (1)
• th[scope="row"][style="vertical-align: bottom;"] (1)
• th[rowSpan="2"][scope="row"][style="vertical-align: top;"] (1)
• th[colSpan="3"][style="font: italic 0.9em Arial, x-locale-body, sans-serif; vertical-align: middle;"] (1)
• table.standard-table[style="max-width: 46em;"] (1)

---

Full conversion report: https://gist.github.com/wbamberg/fdf49a295a131dee7fa70aa16f6d9a2d

...these pages contain a lot of rather complicated tables, which are not getting converted. Apart form tables there are zero unconverted elements.

Apart from the usual randomness, the main changes here are:

• removing elements like <a id="AAC"></a>, that are used to provide link targets, and updating any links that use those targets to use heading IDs instead.
• removing elements like <a name="aac-foot-1">[1]</a>, that are used to provide targets for footnotes linked from the tables, and doing something else with the footnote (usually just copying it into the table).

After this PR there will be lots of unconverted tables, but nothing else.

There is good content in this bit of the docs, but I think it would be much more approachable if it were split up into more pages.

[github-actions]

Preview URLs

• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Autoplay_guide
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/DASH_Adaptive_Streaming_for_HTML_5_Video
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Audio_codecs
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Audio_concepts
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Containers
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Image_types
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Support_issues
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Video_codecs
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/Video_concepts
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/WebRTC_codecs
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats/codecs_parameter
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Formats
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/HTML_media
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/Streaming
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/images/aspect_ratio_mapping
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media/images
• https://pr9818.content.dev.mdn.mozit.cloud/en-US/docs/Web/Media

Flaws

Note! 15 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/Media/Autoplay_guide
Title: Autoplay guide for media and Web Audio APIs
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Web/API/HTMLMediaElement/allowedToPlay does not exist

---

URL: /en-US/docs/Web/Media/Formats/WebRTC_codecs
Title: Codecs used by WebRTC
on GitHub
Flaw count: 3

• macros:
  • /en-US/docs/Web/API/MediaStreamTrack/track does not exist
  • /en-US/docs/Web/API/RTCRtpParameters/codecs does not exist
  • /en-US/docs/Web/API/RTCRtpCodecParameters/payloadType does not exist

External URLs

URL: /en-US/docs/Web/Media
Title: Web media technologies
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/Autoplay_guide
Title: Autoplay guide for media and Web Audio APIs
on GitHub

• https://developer.chrome.com/blog/autoplay/ (1 time) (Note! This may be a new URL 👀)
• https://webkit.org/blog/7734/auto-play-policy-changes-for-macos/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/images
Title: Using images in HTML
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/images/aspect_ratio_mapping
Title: Mapping the width and height attributes of media container elements to their aspect-ratio
on GitHub

• https://drafts.csswg.org/css-sizing-4/ (1 time) (Note! This may be a new URL 👀)
• https://github.com/WICG/intrinsicsize-attribute (1 time) (Note! This may be a new URL 👀)
• A more elegant and easier to use solution WICG/intrinsicsize-attribute#16 (1 time) (Note! This may be a new URL 👀)
• https://www.smashingmagazine.com/2019/03/aspect-ratio-unit-css/ (1 time) (Note! This may be a new URL 👀)
• https://www.smashingmagazine.com/2020/03/setting-height-width-images-important-again/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/DASH_Adaptive_Streaming_for_HTML_5_Video
Title: DASH Adaptive Streaming for HTML 5 Video
on GitHub

• 🚨 http://wiki.webmproject.org/adaptive-streaming/instructions-to-playback-adaptive-webm-using-dash (1 time) (Note! This may be a new URL 👀)
• 🚨 http://wiki.webmproject.org/adaptive-streaming/webm-dash-specification (1 time) (Note! This may be a new URL 👀)
• https://bugzilla.mozilla.org/show_bug.cgi?id=778617 (1 time) (Note! This may be a new URL 👀)
• https://dashif.org/ (1 time) (Note! This may be a new URL 👀)
• https://www.ffmpeg.org/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/media-source/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats
Title: Media type and format guide: image, audio, and video content
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/Formats/WebRTC_codecs
Title: Codecs used by WebRTC
on GitHub

• https://datatracker.ietf.org/doc/html/rfc6184 (3 times) (Note! This may be a new URL 👀)
• https://support.mozilla.org/en-US/kb/firefox-android-openh264 (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-G.711-198811-I/en (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats/Audio_concepts
Title: Digital audio concepts
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/Formats/Containers
Title: Media container formats (file types)
on GitHub

• https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFPreface/qtffPreface.html (1 time) (Note! This may be a new URL 👀)
• https://docs.microsoft.com/en-us/windows/desktop/xaudio2/resource-interchange-file-format--riff- (1 time) (Note! This may be a new URL 👀)
• https://en.flossmanuals.net/ogg-theora/ (1 time) (Note! This may be a new URL 👀)
• https://matroska.org/technical/specs/index.html (1 time) (Note! This may be a new URL 👀)
• https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1441 (1 time) (Note! This may be a new URL 👀)
• https://w3c.github.io/media-source/webm-byte-stream-format.html (1 time) (Note! This may be a new URL 👀)
• https://web.archive.org/web/20090417165828/http://www.kk.iij4u.or.jp/~kondo/wave/mpidata.txt (1 time) (Note! This may be a new URL 👀)
• https://www.apple.com/ (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/19180.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/53943.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/55688.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/74427.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/75929.html (1 time) (Note! This may be a new URL 👀)
• https://www.microsoft.com/store/productId/9N5TDP8VCMHS (2 times) (Note! This may be a new URL 👀)
• https://www.webmproject.org/docs/container/ (1 time) (Note! This may be a new URL 👀)
• https://www.xiph.org/ (1 time) (Note! This may be a new URL 👀)
• https://xiph.org/flac/format.html (1 time) (Note! This may be a new URL 👀)
• https://xiph.org/ogg/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats/Support_issues
Title: Handling media support issues in web content
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/Formats/Video_codecs
Title: Web video codec guide
on GitHub

• 🚨 http://hevc.info/ (1 time) (Note! This may be a new URL 👀)
• https://about.att.com/innovation/ip/patents/mpeg-4 (1 time) (Note! This may be a new URL 👀)
• https://aomedia.org/ (2 times) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-spec/ (6 times) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-spec/av1-spec.pdf (1 time) (Note! This may be a new URL 👀)
• https://dev.opera.com/articles/view/introduction-html5-video/ (1 time) (Note! This may be a new URL 👀)
• https://en.flossmanuals.net/ogg-theora/ (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Discrete_cosine_transform (10 times) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/H.262/MPEG-2_Part_2 (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Hybrid_Log-Gamma (2 times) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/ISO/IEC_base_media_file_format (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Moir%C3%A9_pattern (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Motion_compensation (2 times) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Perceptual_Quantizer (1 time) (Note! This may be a new URL 👀)
• https://mpeg.chiariglione.org/ (5 times) (Note! This may be a new URL 👀)
• https://mpeg.chiariglione.org/standards/mpeg-4/advanced-video-coding (1 time) (Note! This may be a new URL 👀)
• https://msdn.microsoft.com/en-us/library/ff975061%28v=vs.85%29.aspx (1 time) (Note! This may be a new URL 👀)
• https://msdn.microsoft.com/en-us/library/ff975073%28v=VS.85%29.aspx (1 time) (Note! This may be a new URL 👀)
• https://www.chromium.org/audio-video (1 time) (Note! This may be a new URL 👀)
• https://www.google.com/ (2 times) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/22411.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/61152.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/69668.html (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/ (2 times) (Note! This may be a new URL 👀)
• https://www.itu.int/ITU-T/recommendations/related_ps.aspx?id_prod=4242 (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-H.262 (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-H.263/ (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-H.264 (1 time) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-H.265 (1 time) (Note! This may be a new URL 👀)
• https://www.itu.net/ (2 times) (Note! This may be a new URL 👀)
• https://www.microsoft.com/en-us/p/web-media-extensions/9n5tdp8vcmhs?activetab=pivot:overviewtab (1 time) (Note! This may be a new URL 👀)
• https://www.mpegla.com/ (1 time) (Note! This may be a new URL 👀)
• https://www.mpegla.com/programs/avc-h-264/ (2 times) (Note! This may be a new URL 👀)
• https://www.mpegla.com/programs/hevc/ (2 times) (Note! This may be a new URL 👀)
• https://www.mpegla.com/programs/mpeg-2/ (1 time) (Note! This may be a new URL 👀)
• https://www.mpegla.com/programs/mpeg-4-visual/ (1 time) (Note! This may be a new URL 👀)
• https://www.theora.org/doc/ (1 time) (Note! This may be a new URL 👀)
• https://www.videolan.org/developers/x264.html (1 time) (Note! This may be a new URL 👀)
• https://www.webmproject.org/vp9/ (1 time) (Note! This may be a new URL 👀)
• https://www.xiph.org/ (1 time) (Note! This may be a new URL 👀)
• https://xiph.org/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats/Video_concepts
Title: Digital video concepts
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/Formats/Image_types
Title: Image file type and format guide
on GitHub

• 🚨 http://www.ercim.org/ (2 times) (Note! This may be a new URL 👀)
• 🚨 http://www.lcs.mit.edu/ (2 times) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-avif/ (1 time) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-spec/av1-spec.pdf (1 time) (Note! This may be a new URL 👀)
• https://bugzil.la/895131 (1 time) (Note! This may be a new URL 👀)
• https://crbug.com/791658 (1 time) (Note! This may be a new URL 👀)
• https://creativecommons.org/licenses/by-sa/3.0/ (2 times) (Note! This may be a new URL 👀)
• https://developer.apple.com/stickers/ (1 time) (Note! This may be a new URL 👀)
• https://developer.apple.com/videos/play/wwdc2020/10663/?time=1174 (1 time) (Note! This may be a new URL 👀)
• https://developers.google.com/speed/webp/docs/riff_container (1 time) (Note! This may be a new URL 👀)
• https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification (1 time) (Note! This may be a new URL 👀)
• https://docs.microsoft.com/en-us/openspecs/dev_center/ms-devcentlp/1c24c7c8-28b0-4ce1-a47d-95fe1ff504bc (1 time) (Note! This may be a new URL 👀)
• https://docs.microsoft.com/en-us/windows/desktop/gdi/bitmap-storage (1 time) (Note! This may be a new URL 👀)
• https://ev.buaa.edu.cn/ (1 time) (Note! This may be a new URL 👀)
• https://gif.ski/ (1 time) (Note! This may be a new URL 👀)
• https://jpeg.org/jpeg/ (1 time) (Note! This may be a new URL 👀)
• https://wiki.mozilla.org/APNG_Specification (1 time) (Note! This may be a new URL 👀)
• https://www.adobe.io/open/standards/TIFF.html (1 time) (Note! This may be a new URL 👀)
• https://www.ctrl.blog/entry/webp-avif-comparison.html (1 time) (Note! This may be a new URL 👀)
• https://www.keio.ac.jp/ (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/ (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/Consortium/Legal/copyright-documents (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/Consortium/Legal/copyright-software (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/Consortium/Legal/ipr-notice (4 times) (Note! This may be a new URL 👀)
• https://www.w3.org/Graphics/GIF/spec-gif87.txt (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/Graphics/GIF/spec-gif89a.txt (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/PNG (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/PNG/ (3 times) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/SVG2 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats/Audio_codecs
Title: Web audio codec guide
on GitHub

• 🚨 http://lame.sourceforge.net/ (1 time) (Note! This may be a new URL 👀)
• 🚨 http://www.voiceage.com/AMR-NB.AMR.html (1 time) (Note! This may be a new URL 👀)
• 🚨 http://www.voiceage.com/Overview-lic.html (1 time) (Note! This may be a new URL 👀)
• https://brew.sh/ (1 time) (Note! This may be a new URL 👀)
• https://ffmpeg.org/ (1 time) (Note! This may be a new URL 👀)
• https://github.com/macosforge/alac (1 time) (Note! This may be a new URL 👀)
• https://gstreamer.freedesktop.org/ (2 times) (Note! This may be a new URL 👀)
• https://handbrake.fr/ (1 time) (Note! This may be a new URL 👀)
• https://www.apple.com/itunes (1 time) (Note! This may be a new URL 👀)
• https://www.audacityteam.org/ (1 time) (Note! This may be a new URL 👀)
• https://www.ietf.org/ (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/22412.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/26797.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/43345.html (1 time) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/53943.html (1 time) (Note! This may be a new URL 👀)
• https://www.via-corp.com/licensing/aac/ (1 time) (Note! This may be a new URL 👀)
• https://www.xiph.org/vorbis/ (1 time) (Note! This may be a new URL 👀)
• https://xiph.org/ (2 times) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Formats/codecs_parameter
Title: The "codecs" parameter in common media types
on GitHub

• https://aomediacodec.github.io/av1-isobmff (1 time) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-isobmff/ (1 time) (Note! This may be a new URL 👀)
• https://aomediacodec.github.io/av1-spec/ (2 times) (Note! This may be a new URL 👀)
• https://github.com/w3c/webrtc-svc (1 time) (Note! This may be a new URL 👀)
• https://mp4ra.org/ (3 times) (Note! This may be a new URL 👀)
• https://www.iso.org/standard/54838.html (2 times) (Note! This may be a new URL 👀)
• https://www.itu.int/rec/T-REC-H.273/en (3 times) (Note! This may be a new URL 👀)
• https://www.webmproject.org/vp9/mp4 (1 time) (Note! This may be a new URL 👀)
• https://www.webmproject.org/vp9/mp4/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/Media/Streaming
Title: Guide to streaming audio and video
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Media/HTML_media
Title: Using audio and video in HTML
on GitHub

No new external URLs

(this comment was updated 2021-10-15 17:44:10.028940)

[Rumyra]

Added a couple of amends but it all looks good to me