As of today (2025-10-14), I intend to turn support for |math-shift:
compact| on by default. It has been developed behind the
|mathml.math_shift.enabled| preference.
*Summary*: Superscripts with |math-shift: compact| will be placed
slightly lower (using the |superscriptShiftUpCramped| parameter from the
OpenType MATH table instead of |superscriptShiftUp|). This property is
applied to scripts in small spaces, such as radicals or fraction
denominators. In TeX this is called cramped mode.
Inequality between square root of x squared and x squared. The
superscripts for the squared variables are not at the same height, the
one under the square root is slightly lower to fit below
*Bug*: https://bugzilla.mozilla.org/show_bug.cgi?id=1923569
*Bug to turn on by default*:
https://bugzilla.mozilla.org/show_bug.cgi?id=1994171
*Standard*: https://w3c.github.io/mathml-core/#the-math-shift
*Standards Body*: W3C.
*Platform coverage*: All platforms.
*Preference*: |mathml.math_shift.enabled|
*Other browsers*:
* Blink: shipped, no flags.
* WebKit: shipped in version 227, no flags.
*web-platform-tests*:
* New tests to check the parsing of the property:
o |/mathml/relations/css-styling/parsing/math-shift-valid.html|
<https://github.com/web-platform-tests/wpt/blob/master/mathml/relations/css-styling/parsing/math-shift-valid.html>
o |/mathml/relations/css-styling/parsing/math-shift-invalid.html|
<https://github.com/web-platform-tests/wpt/blob/master/mathml/relations/css-styling/parsing/math-shift-invalid.html>
o |/mathml/relations/css-styling/parsing/math-shift-computed.html|
<https://github.com/web-platform-tests/wpt/blob/master/mathml/relations/css-styling/parsing/math-shift-computed.html>
* Existing tests that are now passing:
o |/mathml/presentation-markup/scripts/cramped-001.html|
<https://github.com/web-platform-tests/wpt/blob/master/mathml/presentation-markup/scripts/cramped-001.html>
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