Sync from original #1

favour -> favor

Fix a missing closing parenthesis in code sample.

* Access-Control-Expose-Headers clarification * Improve the description of safelisted headers * Content-Length - added to safelisted * FF86 Release note Co-authored-by: Michael[tm] Smith <mike@w3.org>

I added that it is often used in conjunction with z-index too, since it creates a new stacking context which does not interact with the content surrounding it. This is especially true for the body, which has a default z-index of auto and prevents the user from interacting with elements with a negative z-index if isolation is set to none. See https://coder-coder.com/z-index-isnt-working/ for more information.

Fixes #2789

* HTTP Referer-Policy - new default value in spec * HTTP Referer header - better links to policy * Referer security concerns: minor subedit * Add release notes, improve directives

Fixes #2791

* Update CORS doc with section on credentials in preflight * improve wording * Using Fetch: Fix flaws * Cross link to cors docs from Using Fetch * Add release note * Minor fix * Change not typically to should not * Fix up fetch API cookie sending mess * Update files/en-us/mozilla/firefox/releases/87/index.html Co-authored-by: Anne van Kesteren <annevk@annevk.nl> * Clarify when cross site cookies are sent * Fixes due to feedback from annevk * copy edit * copy edit * Fixes following feedback Co-authored-by: Anne van Kesteren <annevk@annevk.nl> Co-authored-by: Chris Mills <cmills@mozilla.com>

This change adds a deprecated header to the articles and subarticles for the following features: - VRDisplayCapabilities - VRDisplayEvent - VRDisplay - VREyeParameters - VRFrameData - VRLayerInit - VRPose - VRStageParameters Related: #80

Related: #80

favour -> favor

- Depreceated `summary` on tables - Unopened STRONG and CODE tags - Duplicate IDs - Space in ID value

Co-authored-by: Eric Bailey <ericwbailey@users.noreply.github.com> Co-authored-by: Andrew Somers <Myndex@users.noreply.github.com>

…double parentheses from appearing (#2808)

* Remove never-supported MathML element <mglyph> * Remove never-supported MathML <math> attribute overflow * Remove never-supported MathML element <mlabeledtr> * Remove never-supported MathML <mo> attributes form, largeop * Remove never-supported MathML <mspace> attribute linebreak * Remove never-supported MathML <mystyle> attribute decimalpoint * Remove never-supported MathML <mtable> attributes: alignmentscope, columnwidth, equalcolumns, equalrows, groupalign, minlabelspacing, side * Remove never-supported MathML <mtd> attribute groupalign mdn/browser-compat-data#6958 * Remove never-supported MathML <mtr> attribute groupalign mdn/browser-compat-data#6958 * Remove more <mglyph> mentions * Remove more <mlabeledtr> mentions * Remove more <math> attribute overflow mentions * Remove more <mo> attributes form and largeop mentions * Remove more <mspace> attribute linebreak mentions * Remove more <mstyle> attribute decimalpoint mentions * Remove more mentions of <mtable> attributes: alignmentscope columnwidth equalcolumns equalrows groupalign minlabelspacing side * Remove more <mtd> attribute groupalign mentions * Remove more <mtr> attribute groupalign mentions * Remove columnwidth dd left behind in 7b2b659

* Typo: add Svelte tutorial to the list * Fix link text and wording

* yarn content move Web/API/DocumentOrShadowRoot/pictureInPictureElement Web/API/Document/pictureInPictureElement * Update document.pictureInPictureElement * Add propety to document interface page * Fix various links * Add property to ShadowRoot page * Change HTMLVideoElement to Element (as per spec) * Add new page for ShadowRoot.pictureInPictureElement * copy edit * Address feedback * Manually update wrong redirect Co-authored-by: Chris Mills <cmills@mozilla.com>

We use *deprecated* now (rather than *obsolete*).

* Add Serial interface and its members. * Add SerialPort interface and its members. * Tidy up of existing pages * Update files/en-us/web/api/serial/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/open/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/writable/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/ondisconnect/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/onconnect/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/onconnect/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serial/requestport/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serial/onconnect/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serial/requestport/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serialport/onconnect/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> * Update files/en-us/web/api/serial/index.html Co-authored-by: Ruth John <Rumyra@users.noreply.github.com> Co-authored-by: Rachel Andrew <me@rachelandrew.co.uk> Co-authored-by: Rachel Andrew <rachel.andrew@edgeofmyseat.com> Co-authored-by: Ruth John <Rumyra@users.noreply.github.com>

* Navigator.serial and WorkerNavigator.serial * Update files/en-us/web/api/navigator/serial/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/workernavigator/serial/index.html Co-authored-by: Joe Medley <jmedley@google.com> Co-authored-by: Joe Medley <jmedley@google.com>

flavour -> flavor

Addressing the fact that `nobr` does enjoy wide support.

"Methods of the Date object" had an errant '<' visible within text. Originally "Methods of the Date< object"

* flaws and double brackets in image * fix

- match the "mid-air collisions" to the corresponding reference

flavour -> flavor

* Make the PWA code more modern and readable * curly braces * escape < * remove log

The mglyph and mlabeledtr articles were removed in 44112ad (#2691), but some dangling redirects got left behind. #2866 (comment) is a CI failure this caused.

In case something got moved or deleted.

This fixes typo in the example section .

* Fixed cssxref errors in learn/css/css_layout/grids to prevent double-double parentheses from appearing * Upgraded LiveSample for margin-inline * Upgraded LiveSample for margin-inline * Upgraded LiveSample for margin-block * Tweaked LiveSample for margin-inline * Tweaked LiveSample for margin-block * Minor edit to margin-block * Minor edits to margin-block and margin-inline

* clipboarditem updates * casing * dancing * dancing * Update files/en-us/web/api/clipboarditem/clipboarditem/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/clipboarditem/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/clipboarditem/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/clipboarditem/presentationstyle/index.html Co-authored-by: Joe Medley <jmedley@google.com> * fixes Co-authored-by: Joe Medley <jmedley@google.com>

* Issue 2692: Update Beacon API docs * Issue 2692: Update event pages * Issue 2692: delete 'Using the Beacon API' * Fix _redirects file * Fix _redirects.txt Ran `yarn content fix-redirects en-us` and it fixed the _redirects.txt file — by moving the /en-US/docs/Web/API/Beacon_API/Using_the_Beacon_API line where it’s apparently expected. From that I infer the problem was that the linter expects the file to be sorted, and the /en-US/docs/Web/API/Beacon_API/Using_the_Beacon_API line was out of sort order. * Copy-edit: improve wording Co-authored-by: Michael[tm] Smith <mike@w3.org> * Copy-edit: improve wording Co-authored-by: Michael[tm] Smith <mike@w3.org> * Use an ordered list for a series of linked steps Co-authored-by: Michael[tm] Smith <mike@w3.org> * Use an ordered list for a series of linked steps Co-authored-by: Michael[tm] Smith <mike@w3.org> * Use en-US spelling Co-authored-by: Michael[tm] Smith <mike@w3.org> * Use an ordered list for a series of linked steps Co-authored-by: Michael[tm] Smith <mike@w3.org> * Copy-edit: improve wording Co-authored-by: Michael[tm] Smith <mike@w3.org> * Use an ordered list for a series of linked steps Co-authored-by: Michael[tm] Smith <mike@w3.org> * Copy-edit: improve wording Co-authored-by: Michael[tm] Smith <mike@w3.org> Co-authored-by: Michael[tm] Smith <mike@w3.org>

* Update index.html organise -> organize * Update files/en-us/learn/server-side/django/admin_site/index.html Co-authored-by: wbamberg <will@bootbonnet.ca>

Fixed the spelling of "follow" from "follw" in the "HTML attribute: step" documentation page

* Push the “fixable flaws” button * Fix spec link in showOpenFilePicker doc Fixes #2337 * Update files/en-us/web/api/window/showopenfilepicker/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> Co-authored-by: wbamberg <will@bootbonnet.ca>

* Added reference to the File System Access API This page currently lists Ajax solutions as the only option for read files by pathname, but it should also reference the File System Access API. * Whoops, forgot a closing paren * Updated first two agreed changes * Clarify restrictions on FileReader; remove note formatting Co-authored-by: Will <>

Removed reduntant parentheses from CSS attr() function reference

In the live version of the sequencer this page describes how to create, there exists a commit that does the same thing as this commit does for this page, except it does it for all applicable variable declarations, instead of the subset I verified on this page. There are probably more variable declarations that can use `const` instead of `let` on this page. See mdn/webaudio-examples@1217eb8.

It is rather key that `includes` performs a _case-sensitive_ search for the `searchString` provided. As such, I thought it would be good to include this in the opening paragraph.

The `hgroup` element is deprecated. It is currently listed at the bottom of the [HTML elements reference page](https://developer.mozilla.org/en-US/docs/Web/HTML/Element) under the [Obsolete and deprecated elements](https://developer.mozilla.org/en-US/docs/Web/HTML/Element#obsolete_and_deprecated_elements) section, but also appears alongside non-deprecated elements in the [Content sectioning](https://developer.mozilla.org/en-US/docs/Web/HTML/Element#content_sectioning) section. Removing this tag will remove it from the section of non-deprecated elements, created from the reference on [line 38 of elements/index.html](https://github.com/mdn/content/blob/f37c24de21200c64921064e536ea591d71df6cb3/files/en-us/web/html/element/index.html#L38).

* Experimental features: remove color-scheme-simulation pref * Cross link the media query to the developer tools * Initial work on Examine/edit CSS page * Fix up images and docs * Add release note for FF87 * Also add see also link to page inspector tools * Compressed images * Fixes following feedback * updates following bcd feedback * small correction Co-authored-by: Chris Mills <cmills@mozilla.com>

* Push the “fixable flaws” button * Clarify what gets percent-encoded in data URLs Also fixes #2840

* adding issue/pr templates * clarifying text as per sideshowbarker comment

https://html.spec.whatwg.org/multipage/obsolete.html#navigatorplugins Related BCD change: mdn/browser-compat-data#9338

https://html.spec.whatwg.org/multipage/obsolete.html#dom-navigator-javaenabled Co-authored-by: Ruth John <Rumyra@users.noreply.github.com>

Removing lastModified, delayed and createDelayed(). As we are not adding them to BCD it's also confusing to have them on the landing page.

* updates * copy edit * copy edit * copy edit Co-authored-by: Chris Mills <cmills@mozilla.com>

* Trusted Types API Overview * Update files/en-us/web/api/trusted_types_api/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/trusted_types_api/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/trusted_types_api/index.html Co-authored-by: Joe Medley <jmedley@google.com> * Update files/en-us/web/api/trusted_types_api/index.html Co-authored-by: Joe Medley <jmedley@google.com> Co-authored-by: Joe Medley <jmedley@google.com>

…erty (#2725) * Push the “fixable flaws” button * Clarify: lastIndex is RegExp instance property This change updates the RegExp article to correct a misclassification of lastIndex as a static property; it’s not a static property, but instead an instance property. However, it’s not a property of RegExp.prototype but instead is only exposed from RegExp instances — so this change adds some special-casing for that in the article for lastIndex itself, as well as in the RegExp article. Fixes #2708 * Use "RegExp: lastIndex" in list

dialogue -> dialog

Fixes #2658

This achieves consistency with a similar header that uses <code></code> tags, in the same article.

* Split out DOMParser.parseFromString; fix various errors and omissions in the DOMParser docs * Escape HTML in examples * Fix fixable flaws * "a HTML Document" -> "an HTML Document" Co-authored-by: Michael[tm] Smith <mike@w3.org> * "a HTML" -> "an HTML" Co-authored-by: Michael[tm] Smith <mike@w3.org> * Code formatting for MIME type Co-authored-by: Michael[tm] Smith <mike@w3.org> Co-authored-by: Will <> Co-authored-by: Michael[tm] Smith <mike@w3.org>

* `` is an element, not a property; grammar. * Rephrase sentence for correctness and simplicity * Update files/en-us/web/css/css_text/wrapping_text/index.html Co-authored-by: Rachel Andrew <me@rachelandrew.co.uk>

Fixes #2237

Fixes #2959

* Perceived performance - reorg * Feedback fixes and cut back glossary * Further fixes

See mdn/browser-compat-data#9400.

Bumps [@mdn/yari](https://github.com/mdn/yari) from 0.4.238 to 0.4.244. - [Release notes](https://github.com/mdn/yari/releases) - [Changelog](https://github.com/mdn/yari/blob/main/docs/npm-releases.md) - [Commits](mdn/yari@v0.4.238...v0.4.244) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

dialogue -> dialog

* Fix broken links in NSS project * Update files/en-us/mozilla/projects/nss/ssl_functions/old_ssl_reference/index.html Co-authored-by: Peter Bengtsson <peterbe@mozilla.com> Co-authored-by: Peter Bengtsson <peterbe@mozilla.com>

* Updated Typo Fixes #2658 * removed const n = 15, Fixes #2966

* Fixes #iss2521 * Added the suggested changes * Splitted it in 3 sections * Update files/en-us/web/javascript/reference/operators/instanceof/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> * Update files/en-us/web/javascript/reference/operators/instanceof/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> * Update files/en-us/web/javascript/reference/operators/instanceof/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> * Update files/en-us/web/javascript/reference/operators/instanceof/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> * Remove extra heading Co-authored-by: wbamberg <will@bootbonnet.ca> Co-authored-by: Will <>

* adding doc priorities explainer * updates based on wbamberg feedback * add numbers of documents in each tree/tier * alphabetize all the things

* glossary entry * copy edit Co-authored-by: Chris Mills <cmills@mozilla.com>

It's already a redirect. Also one last instance of LongRange.

There need a comma in the last list.

ref https://bugzilla.mozilla.org/show_bug.cgi?id=1680279

Bumps [@mdn/yari](https://github.com/mdn/yari) from 0.4.244 to 0.4.248. - [Release notes](https://github.com/mdn/yari/releases) - [Changelog](https://github.com/mdn/yari/blob/main/docs/npm-releases.md) - [Commits](mdn/yari@v0.4.244...v0.4.248) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…2997)

Co-authored-by: Eric Bailey <ericwbailey@users.noreply.github.com>

Avoids an id/anchor collision between Example's and Sources's strict-dynamic sections. This document embeds the Sources section from `Web/HTTP/Headers/Content-Security-Policy/default-src` which already sets a `strict-dynamic` id, and both end up in the resulting page[1]. Consequently, the `strict-dynamic` anchor in this document here - the second one in the DOM - was not linkable as desired. This change is a bit desperate as it is only a manual solution for the one problem I spotted. A systemic solution would be preferred. I can envision e.g. consistently tagging the sources - so all of them become linkable - and doing so with a "sources" prefix to limit the likelihood of collisions but that would break existing links/bookmarks. I assume this is not the first time a problem like this popped up in a large project like this and maybe someone has a goto solution which can be applied as a follow-up. [1]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src

…lity (#3020)

There's also a "css.properties.grid-template-rows.subgrid" entry in BCD, but its status should be the same.

* adding complte beginner starter guides * fixing markdown linting errors

Bumps [@mdn/yari](https://github.com/mdn/yari) from 0.4.248 to 0.4.253. - [Release notes](https://github.com/mdn/yari/releases) - [Changelog](https://github.com/mdn/yari/blob/main/docs/npm-releases.md) - [Commits](mdn/yari@v0.4.248...v0.4.253) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* adding shared processes * making changes to address Ryuno-Ki comments

* add initial rfc to repo * update table markdown, add rfcs to markdown linting

Fixes #3030

…ace pages (#3029) * Move page and update links * Add docs for ShadowRoot.getAnimations

This appears to have never been a real thing. See mdn/browser-compat-data#9386

dialogue -> speech

* yarn content move Web/API/DocumentOrShadowRoot/getSelection Web/API/Document/getSelection * Update document.getSelection page * Update links * Add ()

…3057)

Improve grammar, clarity and readability. Previously, there was some strange wording (words out of order and an odd use of "in case") that caused some head scratching. This change improves the readability of this complex subject (WeakMaps and garbage collection).

* update localization team members * make "Current contributors" consistent

Bumps [@mdn/yari](https://github.com/mdn/yari) from 0.4.253 to 0.4.269. - [Release notes](https://github.com/mdn/yari/releases) - [Changelog](https://github.com/mdn/yari/blob/main/docs/npm-releases.md) - [Commits](mdn/yari@v0.4.253...v0.4.269) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

All this commit does is change Objects of these types are designed to hold small audio snippets, typically less than 45 s. For longer sounds, objects implementing the {{domxref("MediaElementAudioSourceNode")}} are more suitable. The buffer contains data in the following format: non-interleaved IEEE754 32-bit linear PCM with a nominal range between <code>-1</code> and <code>+1</code>, that is, 32bits floating point buffer, with each samples between -1.0 and 1.0. If the {{domxref("AudioBuffer")}} has multiple channels, they are stored in separate buffer. to Objects of these types are designed to hold small audio snippets, typically less than 45 s. For longer sounds, objects implementing the {{domxref("MediaElementAudioSourceNode")}} are more suitable. The buffer contains data in the following format: non-interleaved IEEE754 32-bit linear PCM with a nominal range between <code>-1</code> and <code>+1</code>, that is, a 32-bit floating point buffer, with each sample between -1.0 and 1.0. If the {{domxref("AudioBuffer")}} has multiple channels, they are stored in separate buffers.

This fixes typo in the document .

Bumps [ahmadnassri/action-dependabot-auto-merge](https://github.com/ahmadnassri/action-dependabot-auto-merge) from v2.3 to v2.4. - [Release notes](https://github.com/ahmadnassri/action-dependabot-auto-merge/releases) - [Commits](ahmadnassri/action-dependabot-auto-merge@v2.3...2aef6bb) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…ility (#3092)

Related to mdn/translated-content#124 I think it might be a good idea to also mention the translated-content Whatsdeployed link here too. Good to have.

Fixed plenking, some capitalization, missing images.

Looks as though the original author unintentionally left out "to" in this context.

* Show how to set resolution and frame rate I was searching myself crazy on how to set the resolution and frame rate, and even thought that it's impossible to control, until I found that they are set in getUserMedia(). Make a note where this is set, to save others the headache. * Make it a second note box * Add notecard class

A note about rel="alternate" was placed under the definition for rel="author" instead.

noopener is now implicitly set on `_blank` by default

* Removed the missleading [,...] syntax, wrote it here just with two parameters because in the paragraph it is explicit saying column is optional), Fixes #3126 * Make data optional Co-authored-by: Hamish Willee <hamishwillee@gmail.com>

* Firefox no longer supports PPC Mac OS X So remove mention of PPC Mac OS X. * Firefox 87 caps Mac OS X version at 10.15 This change was made in https://bugzilla.mozilla.org/show_bug.cgi?id=1679929 to work around webcompat problems from websites that broke when the User-Agent string reported "Mac OS X 11.0". Safari also caps the reported Mac OS X version at 10.15 and Chrome plans to cap soon, too. * Restore "PPC Mac OS X" User-Agent string example But note that Firefox no longer officially supports Mac OS X on PowerPC.

Update the discussion place of Japanese translation community - Google Group is less used - Slack and GitHub is actively used

gyroscope.js is not maintained anymore, so replaced it with parallax

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

Fixes #3115

* Add information about firefox default preferences * Fix up following feedback

It appears to never have been shipped and is now long removed: mdn/browser-compat-data#9459

* More NSS project fixes * More fixes * Add more links * Last set of fixes * Yet more

…romPoint (#3069) * Move DocumentOrShadowRoot.elementFromPoint to Document.elementFromPoint * Move DocumentOrShadowRoot.elementsFromPoint to Document.elementsFromPoint * merge redirect into correct position

Pushed the “fix fixable flaws” button.

``` s/<pre.*>(\{\{csssyntax($.*$)?\}\})\n?</pre>/$1/g ```

optimise -> optimize summarise -> summarize

* adding clipboarditem to experimental notes * fixes Co-authored-by: Chris Mills <cmills@mozilla.com>

* fix: flaws in web/api/h* batch 1 * fix: point to /Web/API/SubtleCrypto/digest#supported_algorithms * Update files/en-us/web/api/hashchangeevent/index.html Co-authored-by: wbamberg <will@bootbonnet.ca> Co-authored-by: wbamberg <will@bootbonnet.ca>

Co-authored-by: Michael[tm] Smith <mike@w3.org>

* Remove HTML entities from ids * Use consistent link type

Related: #1584

…3174) tools.ietf.org are being deprecated per https://mailarchive.ietf.org/arch/msg/tools-discuss/oYrAxb3KayPzZ4SNB1DVZTDPPNo/ changes generated with rg -l https://tools.ietf.org/html

* Fixes to subnav * Remove remaining subnavs * Replace all /css section quicklinks with sidebar macro

* Fixes #2878 * made it lowercase, Fixes #2878 * Updating the id so the link works Also added a sentence case as per discussion * Also updating ids Heading ids should be lowercase Co-authored-by: Ruth John <Rumyra@users.noreply.github.com>

* My First Site, Added Glossary Site and fixed the link to device_pixel instead of device_pixels, Fixes #2682 * Applied the Feedback * copy edit Co-authored-by: Chris Mills <cmills@mozilla.com>

Co-authored-by: Will <>

* Correct the Date.p.getTimezoneOffset() doc Fixes #665 * More precisely describe getTimezoneOffset() * Clarify what "local time zone" means * Update code comment to clarify effect of DST

Fixes #2833

* Recommend Number.isNaN(), not global isNan() Fixes #3026 * Add links to more-detailed explanations * Apply suggestions from code review Co-authored-by: Florian Scholz <fscholz@mozilla.com> Co-authored-by: Florian Scholz <fscholz@mozilla.com>

Added links to missing single-element and global attribute references.

* removing -moz media features * copy edit Co-authored-by: Chris Mills <cmills@mozilla.com>

* fail on unsafe html * a deliberately unsafe injection attempt * Revert "a deliberately unsafe injection attempt" This reverts commit 8052dc1.

Related to mdn/browser-compat-data#9402

There is no the-cross-origin-opener-policy-header anchor in the HTML spec; instead the best place for the MDN article to link to is the the-headers anchor, which has the following text: > A Document's cross-origin opener policy is derived from the > `Cross-Origin-Opener-Policy` and the > `Cross-Origin-Opener-Policy-Report-Only` HTTP response headers. These > headers are structured headers whose value must be a token.

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