Add table numbers and captions

[emlun]

Fixes #990.

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[emlun]

I recommend activating "hide whitespace changes" in the diff settings while reviewing this.

[equalsJeffH]

LGTM, thx @emlun! (yet again ;) -- only thing I'd add is that we now have another table in https://w3c.github.io/webauthn/#sctn-authenticator-taxonomy to add a caption to. I merged from master into this branch so that table is here now.

oh, and we do need the new <style> -- i.e., it works except for auto-incrementing the table number? I'm guessing "yes" is the answer.

[emlun]

Ok, I'll do this for the new table too. Thanks!

Yes, the style is needed. Here is how Bikeshed's builtin figure numbering works; without the styles added here, these tables would be captioned and numbered as figures.

Oh, but maybe <table><caption/> is more suitable for this than <figure><table/><figcaption/>; I didn't find that element when I looked around earlier. I'll try changing to that and seeing if that works with Bikeshed; in that case the styles can probably be pruned a bit.

[emlun]

Nope, <table><caption/> requires the caption be placed before the table body.

The max-width style is not necessary for the table numbers, but it prevents the tables from getting oddly offset from the text if viewed on a very wide screen.

[emlun]

See also speced/bikeshed#1314

[equalsJeffH]

LGTM, thx @emlun !

[selfissued]

Looks OK to me