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sousa-gecko/testing/web-platform/tests/css/css-inline/parsing/alignment-baseline-valid.html
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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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HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Inline Layout: parsing alignment-baseline with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#alignment-baseline-property">
<meta name="assert" content="alignment-baseline supports the full grammar 'baseline | text-bottom | alphabetic | ideographic | middle | central | mathematical | hanging | text-top'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<script>
test_valid_value("alignment-baseline", "baseline");
test_valid_value("alignment-baseline", "text-bottom");
test_valid_value("alignment-baseline", "alphabetic");
test_valid_value("alignment-baseline", "ideographic");
test_valid_value("alignment-baseline", "middle");
test_valid_value("alignment-baseline", "central");
test_valid_value("alignment-baseline", "mathematical");
test_valid_value("alignment-baseline", "hanging");
test_valid_value("alignment-baseline", "text-top");
</script>
</body>
</html>