On 02/09/2019 16:11, Frédéric Wang wrote: > Hello, > > Currently MathML attributes mathvariant, displaystyle and scriptlevel > [1] [2] are implemented in WebKit using custom "style resolution" and > "one-glyph rendering" inside the MathML layout code [3] [4] [5]. These > features involve text rendering and interaction with CSS font-size, so > it is difficult to implement them properly and completely that way. > There are known bugs and missing features right now (e.g. mathvariant > transform only applies to one-character strings, automatic > displaystyle/scriptlevel does not work with fractions, etc)
Hi, An update on this, we have been discussing these and new properties with the CSSWG: https://github.com/w3c/csswg-drafts/issues/5384 The math-depth / math-style CSS properties are being implemented in Chromium and renamed/exposed/tweaked in Gecko: https://mathml-refresh.github.io/mathml-core/#the-math-style-property https://mathml-refresh.github.io/mathml-core/#the-math-script-level-property So it makes sense to implement them in WebKit (it seems we still don't have a "intent to" mechanism, but people can follow https://bugs.webkit.org/show_bug.cgi?id=195797). The CSSWG is fine with a new text-transform value for automatic italic but using it for other values is controversial (see https://github.com/w3c/csswg-drafts/issues/3775). So if we want to preserve backward compatibility and fix existing bugs with mathvariant, we should probably re-implement it using an internal math-transform property (like what Gecko does) which according to our previous discussion is nowadays possible in WebKit. -- Frédéric Wang
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