strike element is deprecated, s replaces it

[cloudrac3r]

Pull Request Checklist

• Pull request includes a changelog file
• Pull request includes a sign off
• Pull request is classified as 'other changes'

Description

The strike element is deprecated in the HTML spec. Clients should prefer s instead if they wish to mark text with strikethrough without semantic meaning.

As far as I am aware, no client actually supports sending messages with strikethrough formatting, so this shouldn't affect current compatibility.

I hope I filled out this PR template correctly :)

Signed-off-by: Cadence Ember cadence@disroot.org

Preview: https://pr1629--matrix-spec-previews.netlify.app

[KitsuneRal]

Well, in fact, a few clients support sending raw HTML (I just checked Quaternion and Element Web for a very quick check), and although Quaternion still converts <strike> to <del> even when sent as raw HTML, Element Web doesn't do that and faithfully sends <strike> to the homeserver. I'm afraid this would require a (very simple) MSC therefore.

[MTRNord]

I think the current state is more confusing considering the syntax ele Web input for example uses is <del> and not any of the others.

[KitsuneRal]

Well it's the same old HTML story - <strong> vs. <b> etc. <del> is in the recommended list of tags just as well; even though the tags are sort-of similar semantically, replacing <strike> with <s> is orthogonal to having <del> around.

[anoadragon453]

@cloudrac3r As @KitsuneRal mentioned, this change would require a (small) Matrix Spec Change to carry out. See this documentation for the process. Would you be willing to write one up?

I also wonder if it would be better to instead add s alongside strike, mark strike as deprecated and then eventually remove it sometime in the future?

[richvdh]

Closing this for now. As others have noted, we'll need an MSC.

[cloudrac3r]

@richvdh @anoadragon453 MSC4077 has landed, so this spec change is good to go. Can you reopen?

This will fix #1492.

[anoadragon453]

Re-opening as per @cloudrac3r's request.

[turt2live]

Thanks!