*Summary:* Up until now, Firefox used an internal language
<https://bugzilla.mozilla.org/show_bug.cgi?id=947654>, |x-math|, to
select from a list of mathematical fonts to render MathML |<math>| tags.
CSS has added <https://www.w3.org/TR/css-fonts-4/#math-def> a new |math|
generic font family, which allows authors to style content with a
mathematical font and serves a similar purpose. Additionally, the MathML
Core spec says
<https://w3c.github.io/mathml-core/#the-top-level-math-element> that
|math| should be the default font family for |<math>| tags in the user
agent stylesheet. Replacing |x-math| with |font-family: math| brings
Firefox closer to the spec.
*Bug:* https://bugzilla.mozilla.org/show_bug.cgi?id=1788937.
*Specification:* https://www.w3.org/TR/css-fonts-4/#math-def,
https://w3c.github.io/mathml-core/#the-top-level-math-element.
*Standards Body:* W3C.
*Platform coverage:* All platforms.
*Preference:* |mathml.font_family_math.enabled|.
*Link to standards-positions discussion:*
https://github.com/mozilla/standards-positions/issues/564.
*Other browsers:*
* Blink: shipped in
https://chromium-review.googlesource.com/c/chromium/src/+/2119534.
* WebKit: working on a similar implementation.
*web-platform-tests:*
* Existing tests that are now passing for |math|:
o |mathml/relations/css-styling/default-font-family.html|
<https://github.com/web-platform-tests/wpt/blob/master/mathml/relations/css-styling/default-font-family.html>.
o |css/css-fonts/generic-family-keywords-001.html|
<https://github.com/web-platform-tests/wpt/blob/master/css/css-fonts/generic-family-keywords-001.html>.
o |css/css-fonts/generic-family-keywords-003.html|
<https://github.com/web-platform-tests/wpt/blob/master/css/css-fonts/generic-family-keywords-003.html>.
​
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