I think we have an agreed aim of generally dropping things that were deprecated in MathML3.
This is a tracking issue on the current state: essentially just searched for deprecated in the current gh-pages branch main draft and annotated the results:
mode and macros. Done
https://w3c.github.io/mathml/#presm_deprecatt
fontfamily, fontweight, fontstyle, fontsize, color, background attributes on
Presentation token elements (and mglyph and mstyle)
Full: defined
Core: not defined
schema: mathml4-legacy
Proposal: delete from full spec other than Changes appendix. Mention in notes-on-mathml
attributes on mspacehttps://w3c.github.io/mathml/#attributes-5
linebreak=indentingnewline
Full: half defined (not in attribute table but added as deprecated in the following text)
schema: mathml4-presentation
Proposal: Only mention in Changes appendix and notes-on, move to mathml4-legacy schema
Deprectated mstyle attributeshttps://w3c.github.io/mathml/#deprecated-attributes-0
named space setings thinmathspace=5in
Full: defined to have no effect
Core: Not defined
schema: mathml4-legacy
Proposal: Only mention in Changes appendix and notes-on
inferred mtr and mtdhttps://w3c.github.io/mathml/#presm_mtable
This was already deprecated in mathml2
Full: deprecated
Core: invalid
Schema invalid
Proposal: remove from Full (even the html parser, which does infer tr and td in html tables does not infer these)
base attribute on cnhttps://w3c.github.io/mathml/#contm_cn_extended
Full: States base is deprecated unless type is real or integer
Schema: valid (mathml4-content)
Proposal: just say meaning is undefined rather than deprecate it (it would
be possible to make the relax schema only validate some uses of base,
but at some complication and complicating mapping to dtd and xsd schema).
https://w3c.github.io/mathml/#contm_opel
Full: deprecated in favor of using on cd on csymbol
schema: valid (mathml4-content)
Proposal: drop the deprecation, we probably want to leave open a
possibility of a path that isn't so closely tied to OpenMath
https://w3c.github.io/mathml/#contm_deprecated
declare reln and fn elements
Full: declared deprecated but described
Schema: mathml4-legacy
Proposal: delete section 4.5 just mention in changes appendix and notes-on
(this would also remove some re-write rules which are removing these deprecated uses) Done
Attributes on semanticshttps://w3c.github.io/mathml/#attributes-34
definitionURL and encoding attributes
Full: described but deprecated
schema: not allowed
Proposal: Remove from full, mention in changes and add to mathml4-legacy schema done
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