revisit data-* attributes

[pkra]

As we have moved away from htmlbook as a dependency, we should revisit the data attributes.

Some ideas

• drop unused attributes (e.g., data-type="chapter")
• name attributes consistently (e.g. data-ams, alternatively data-jats to reduce changes in ams-html)

Note: this originates in the mkb-hill3 QA report which suggests replacing data-type="chapter" with epub:type="chapter". This is not strictly necessary since in our workflow each file is exactly one chapter and epub3 specifies that in lieu of epub:type="chapter" and similar markup that's acceptable. If we do something, I'd rather adopt the dpub aria roles here (which epub will adopt in the future).

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• data-type: revise data-type attributes #215, replace data-ams-doc=chapter with role=doc-chapter #218
• data-jats: revise data-jats attributes #216

[pkra]

Current list of data- attributes added in html output

• 84 ocurrences + 1 comment text
• 18 data-type (book, chapter, titlepage, copyright-page, footnote, sect[0-9], toc, bibliography, appendix, preface)
• 65 data-jats & data-jats-* (many for ams-html)
• 1 data-doi (but also data-jats="doi" - sigh)

[pkra]

• data-type attributes can be replaced with something like data-ams-sectioning since the non-sectioning values (footnotes) can be or are already processed via their role attributes.
• data-jats can be replaced with data-ams since data-ams values do not appear as data-jats values (also for data-jats-* and data-ams-*)

Let's also fix data-jats-="mr" (note the trailing -).

[pkra]

For data-type, I'm leaning towards data-ams-doc (instead of data-ams-sectioning) since several can simply be dropped in favor of dpub aria roles (which are prefixed with doc-, e.g., doc-preface, doc-bibliography).

[pkra]

The main work has been merged. Let's test and see.

[pkra]

See also https://github.com/AmerMathSoc/ams-xml-to-html/wiki/data-attributes

[pkra]

Visual regression tests showed no problems.

The only unexpected change were found in bproc34, mcom3351, mcom3354, mcom3358 which have sec@specific-use="paragraph" which will now end up getting the same styling as paragraphs (in ams-html), leading to (mild) additional margin-top.

I consider this an unexpected fix.

[pkra]

All fixed.