Add more information/links to HTML-related obsolete messages

[kfranqueiro]

This is a follow-up to #3975 related to @bruce-usab's feedback.

Previews: H35, H45, H46, H70, H73

[w3cbot]

kfranqueiro marked as non substantive for IPR from ash-nazg.

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[alastc]

@bruce-usab it's really hard to provide a useful link/version, as HTML is a living standard.

Can we just say "obsolete since 2014 in HTML."

[bruce-usab]

Thank you!

[bruce-usab]

Reviewed on TF call.

[fstrr]

Can we just say "obsolete since 2014 in HTML."

Was everything listed above obsoleted in 2014? The linked obsolete page doesn't date when things were obsoleted.

[kfranqueiro]

Can we just say "obsolete since 2014 in HTML."

Was everything listed above obsoleted in 2014? The linked obsolete page doesn't date when things were obsoleted.

• applet, summary, noembed, and frameset/etc. appear in https://www.w3.org/TR/2014/REC-html5-20141028/obsolete.html
  • most of these (except noembed) also appear in https://www.w3.org/TR/html5-diff/#obsolete-attributes (also dated 2014)
• img longdesc seems to be less cut-and-dry as evidenced by the long thread regarding the removal of the associated technique; I'm having trouble finding something aside from the living spec that documents its deprecation, and it later exists as an extension, but it seems to have the issue of spotty support regardless; maybe I remove the "obsolete since 2014" part on that one specifically and leave it at "not widely supported"?

[fstrr]

maybe I remove the "obsolete since 2014" part on that one specifically and leave it at "not widely supported"?

Or just "obsolete in the HTML Living Standard" and still link to the same obsoleted page?

[bruce-usab]

"not widely supported" seems to overstate the support, so maybe "never widely supported"?

I also like "obsolete in the HTML Living Standard"