Ask HN: What is the correct version of “canonical” tag?

1 pointmaxraz2 comments

Could you tell the correct version of the rarely used "canonical" tag, please

VS

Thanks.

For a XHTML doctype, you use the first one.

For a HTML4 doctype, you use the second.

For a HTML5 doctype, you can use either.

Thank you for spending your time to help me, Sir.