Sajid Anwar a3e1d680bb Bug 2010717 - Implement alignment-baseline: alphabetic/ideographic/central/mathematical/hanging. r=layout-reviewers,firefox-style-system-reviewers,dshin ...

Also adds WPT reftests to validate alignment behavior in horizontal and vertical
writing modes with the different `alignment-baseline` values. Additionally:

- The `alignment-baseline: middle` tests have failing expectations. This is
  because the existing implementation does not match the css-inline-3 definition
  (which the new WPTs follow). See Bug 2030203.

- The WidthTest-Regular.otf support font was updated to remove its unusual
  ideographic-under baseline value, which affected its synthesized central
  baseline. With the new support for `alignment-baseline: central`, this broke a
  number of `text-combine-upright-compression-*` WPT reftests. The non-centered
  baseline values were removed from this test using FontForge, so that the
  synthesized central baseline matched the expectation of the test references.

Differential Revision: https://phabricator.services.mozilla.com/D292136

2026-05-19 13:49:52 +00:00

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line-height-invalid.html.ini

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line-height-valid.html.ini

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