Add compatibility data for legacy MathML lengths #17934
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MDN contains a section about legacy MathML lengths [1] and refers to a browser compatibility table `mathml.attribute_values` that is currently missing. This commit adds relevant compatibility data for two kinds of accepted values mentioned in this section: - non-zero unitless length values (e.g. `5` to mean 500%), - named spaces (e.g. `thinmathspace` to mean 3/18em) The edge case numbers ending with a dot (e.g. `34.px`) is ignored, that seems a bug in MathML 3 that is not even mention in version 4 [2] and is not super important for web developers. Corresponding data is added for length attributes, namely mfrac's linethickness, mo's lspace/rspace/maxsize/minsize, mspace's depth/height/width, mtable's width and the global mathsize attribute (note that non-zero unitless is not added for mspace, it's not relevant since the default dimensions are 0 anyway). These features have been implemented a long time in Gecko, before the first release of Firefox. Unitless values have been removed in Firefox 70 [3] and the there is plan to disable the pref for named spaces [4]. The two features have also been implemented in Safari 10 [5] and there is no plan to implement them in Chromium since they are not part of MathML Core. [1] https://developer.mozilla.org/en-US/docs/Web/MathML/Attribute/Values#legacy_mathml_lengths [2] https://w3c.github.io/mathml/#fund_units |3] https://bugzilla.mozilla.org/show_bug.cgi?id=1574749#c8 [4] https://bugzilla.mozilla.org/show_bug.cgi?id=1793549 [5] https://commits.webkit.org/136199@main
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Makes clear that accepted values are `<length-percentage>` but add notes about legacy MathML lengths. Compatibility tables are updated in mdn/browser-compat-data#17934
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* Small tweak for mathsize and mtable@width Makes clear that accepted values are `<length-percentage>` but add notes about legacy MathML lengths. Compatibility tables are updated in mdn/browser-compat-data#17934 * fix links * Update files/en-us/web/mathml/attribute/index.md Co-authored-by: Florian Scholz <fs@florianscholz.com>
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Summary
MDN contains a section about legacy MathML lengths [1] and refers to a browser compatibility table
mathml.attribute_valuesthat is currently missing. This commit adds relevant compatibility data for two kinds of accepted values mentioned in this section:5to mean 500%),thinmathspaceto mean 3/18em)The edge case numbers ending with a dot (e.g.
34.px) is ignored, that seems a bug in MathML 3 that is not even mention in version 4 [2] and is not super important for web developers.Corresponding data is added for length attributes, namely mfrac's linethickness, mo's lspace/rspace/maxsize/minsize, mspace's depth/height/width, mtable's width and the global mathsize attribute (note that non-zero unitless is not added for mspace, it's not relevant since the default dimensions are 0 anyway).
Test results and supporting details
These features have been implemented a long time in Gecko, before the first release of Firefox. Unitless values have been removed in Firefox 70 [3] and the there is plan to disable the pref for named spaces [4]. The two features have also been implemented in Safari 10 [5] and there is no plan to implement them in Chromium since they are not part of MathML Core.
[1] https://developer.mozilla.org/en-US/docs/Web/MathML/Attribute/Values#legacy_mathml_lengths
[2] https://w3c.github.io/mathml/#fund_units
|3] https://bugzilla.mozilla.org/show_bug.cgi?id=1574749#c8
[4] https://bugzilla.mozilla.org/show_bug.cgi?id=1793549
[5] https://commits.webkit.org/136199@main
Related issues
N/A