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Document the deprecation policy of HTML tags. (#1732)

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* Deprecate `strike` HTML tag

Replace it with `s` or `del`.

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Add changelog

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Remove strike deprecation and add added-in annotation

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Add link to HTML standard

Co-authored-by: Hubert Chathi <hubertc@matrix.org>

* Update changelogs/client_server/newsfragments/1732.clarification

---------

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>
Co-authored-by: Hubert Chathi <hubertc@matrix.org>
Co-authored-by: Travis Ralston <travpc@gmail.com>
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Kévin Commaille 2024-03-03 01:11:05 +01:00 • committed by GitHub
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Document the deprecation policy of HTML tags, as per [MSC4077](https://github.com/matrix-org/matrix-spec-proposals/pull/4077).

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content/client-server-api/modules/instant_messaging.md
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@ -48,6 +48,13 @@ tags to permit, denying the use and rendering of anything else, is:
`s`, `code`, `hr`, `br`, `div`, `table`, `thead`, `tbody`, `tr`, `s`, `code`, `hr`, `br`, `div`, `table`, `thead`, `tbody`, `tr`,
`th`, `td`, `caption`, `pre`, `span`, `img`, `details`, `summary`. `th`, `td`, `caption`, `pre`, `span`, `img`, `details`, `summary`.
{{% boxes/note %}}
{{% added-in v="1.10" %}}
HTML features MAY be deprecated and replaced by their modern equivalent without
requiring a [Spec Change Proposal](/proposals) when they are deprecated in the
[WHATWG HTML Living Standard](https://html.spec.whatwg.org/multipage/).
{{% /boxes/note %}}
Not all attributes on those tags should be permitted as they may be Not all attributes on those tags should be permitted as they may be
avenues for other disruption attempts, such as adding `onclick` handlers avenues for other disruption attempts, such as adding `onclick` handlers
or excessively large text. Clients should only permit the attributes or excessively large text. Clients should only permit the attributes