Hi,
In bug 1574750, I intend to deprecate mathspace names for MathML length
values ("thinmathspace", "mediummathspace", "thickmathspace", etc) which
only have suggested values [1].
The MathML CG agreed to remove them from MathML Core as they can be
replaced with equivalent em values [2]. However, they have been
implemented in both WebKit and Gecko and some MathML content & tools use
them, so we will need to be careful. For now, they will only be disabled
in nightly build.
[1] https://www.w3.org/TR/MathML3/chapter2.html#type.namedspace
[2]
https://github.com/mathml-refresh/mathml/issues/75#issuecomment-523016332
--
Frédéric Wang
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