Add subfeature for <ms> lquote/rquote attributes #17928
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In MathML Core the `<ms>` element behaves like an `<mtext>` [1] and this is how it was implementated in Safari 9 [2] and Chromium. Firefox still supports a legacy implementation from MathML3 (surround content with quotes, specifiable via attributes) but will be removed in the future [3]. To facilitate comparison of browser support, this commit introduces a subfeature for that legacy implementation. [1] https://w3c.github.io/mathml-core/#string-literal-ms [2] https://commits.webkit.org/157302@main [3] https://bugzilla.mozilla.org/show_bug.cgi?id=1793387
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Summary
In MathML Core the
<ms>element behaves like an<mtext>[1] and this is how it was implementated in Safari 9 [2] and Chromium. Firefox still supports a legacy implementation from MathML3 (surround content with quotes, specifiable via attributes) but will be removed in the future [3]. To facilitate comparison of browser support, this commit introduces a subfeature for that legacy implementation.Test results and supporting details
[1] https://w3c.github.io/mathml-core/#string-literal-ms
[2] https://commits.webkit.org/157302@main
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=1793387
Related issues
mdn/content#21248