Hi, In bug 1574750, I intend to deprecate mathspace names for MathML length values ("thinmathspace", "mediummathspace", "thickmathspace", etc) which only have suggested values .
The MathML CG agreed to remove them from MathML Core as they can be replaced with equivalent em values . 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.  https://www.w3.org/TR/MathML3/chapter2.html#type.namedspace  https://github.com/mathml-refresh/mathml/issues/75#issuecomment-523016332 -- Frédéric Wang _______________________________________________ dev-platform mailing list email@example.com https://lists.mozilla.org/listinfo/dev-platform