HTML 5 syntax error with rel='https://api.w.org/'

[zhanglide2018]

HTML 5 syntax error with rel='​https://api.w.org/', can not pass W3C validation.

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Validator URL:​https://validator.w3.org/

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Validator output:

Error: Bad value https://api.w.org/ for attribute rel on element link: The string https://api.w.org/ is not a registered keyword.
From line 52, column 1; to line 52, column 73
</script><link rel='https://api.w.org/' href='https://hyper-matrix.org/wp-json/'/><scri

[GaryJ]

Hi zhanglide2018 - welcome, and thanks for opening your first ticket.

I think the issue you've found might be a duplicate of #37800. Try the patch there, and if that fixes your issue, then this one can be closed as a duplicate.

[zhanglide2018]

Replying to GaryJ:

Hi zhanglide2018 - welcome, and thanks for opening your first ticket.

I think the issue you've found might be a duplicate of #37800. Try the patch there, and if that fixes your issue, then this one can be closed as a duplicate.

Hi GaryJ, thank you for your reply and help. I have already checked #37800, but it doesn't fix my issue.

[rmccue]

I dug into this a bit; custom URI relations are not valid in the ​WHATWG HTML spec per ​this issue, however they are valid in the ​W3C HTML5 spec per ​this issue (basically same as the other one).

Anyway, the text of the W3C spec says:

The remaining values must be accepted as valid if they are absolute URLs containing US-ASCII characters only and rejected otherwise.

That's true for https://api.w.org/. I suspect the issue is that the validator is coded to follow the WHATWG spec, rather than the W3C spec.

Anyway, tl;dr, we can add it to the ​Microformats page, and then it's definitely valid in either spec.

This is hence a task to add to that wiki page. :)

[zhanglide2018]

Replying to rmccue:

I dug into this a bit; custom URI relations are not valid in the ​WHATWG HTML spec per ​this issue, however they are valid in the ​W3C HTML5 spec per ​this issue (basically same as the other one).

Anyway, the text of the W3C spec says:

The remaining values must be accepted as valid if they are absolute URLs containing US-ASCII characters only and rejected otherwise.

That's true for https://api.w.org/. I suspect the issue is that the validator is coded to follow the WHATWG spec, rather than the W3C spec.

Anyway, tl;dr, we can add it to the ​Microformats page, and then it's definitely valid in either spec.

This is hence a task to add to that wiki page. :)

Thanks a lot!

[rmccue]

This is a task unrelated to WP releases, so removing Milestone.

[rmccue]

#40074 was marked as a duplicate.

[rmccue]

This was added to the Microformats wiki page, so is totally a valid relation; this means the ticket is fixed, rather than worksforme. :)

[ocean90]

#45536 was marked as a duplicate.