MathML Core Testsuite

Local mirror of the W3C MathML Core (MathML v4) testsuite, sourced from the Web Platform Tests (WPT) monorepo at https://github.com/web-platform-tests/wpt/tree/master/mathml .

MathML Core is the modern, core subset of MathML. The W3C no longer maintains a standalone MathML testsuite — the tests have been contributed to the WPT monorepo.

Source

• WPT monorepo: https://github.com/web-platform-tests/wpt

• MathML subdirectory: mathml/ in the master branch

• Spec: https://w3c.github.io/mathml-core/

What is synced

The mathml/ subdirectory contains extracted <math> elements as standalone .mml files, with the directory structure mirroring the WPT source.

Directory	Description
mathml/presentation-markup	MathML presentation element tests (fractions, operators, scripts, radicals, tables, tokens, direction, spaces, mrow, mpadded, menclose)
mathml/relations	CSS-MathML interaction tests
mathml/crashtests	Crash regression tests (including mozilla/ subdirectory)

The raw WPT files (HTML/XHTML) live in .wpt-cache/mathml/ and are not copied into mathml/ — only the extracted <math> elements are.

Note	Some WPT tests — particularly crashtests — contain intentionally malformed MathML that browsers tolerate but is not valid MathML (e.g. missing <math> wrappers, unclosed tags, invalid nesting). These are skipped during extraction.

Root-level files synced from mathml/:

• META.yml — WPT metadata (spec URL, suggested reviewers)

• WEB_FEATURES.yml — Web Features configuration

• README.md — Documents font requirements and tools

Sync

# Install dependencies (first time only)
bundle install

# Clone wpt monorepo (sparse, shallow) and extract .mml files on first run
./scripts/sync.rb

# Pull latest from upstream and re-extract on subsequent runs
./scripts/sync.rb

The script clones the full wpt monorepo using git sparse checkout to fetch only the mathml/ subtree, keeping the local clone small. A .wpt-cache/ directory inside this repo holds the wpt cache; it is excluded from version control via .gitignore.

Requires: git, Ruby 3.x, Bundler, Nokogiri

Test Format

Tests use standard WPT formats:

• Reftest — visual comparison via <link rel="match"> / <link rel="mismatch">

• testharness.js — programmatic assertions (assert_true, assert_approx_equals, etc.)

Support utilities in mathml/support/: feature-detection.js, fonts.js, box-comparison.js, layout-comparison.js, etc.

Tests require Web fonts (WOFF) generated by the scripts in mathml/tools/ using FontForge.

License

These tests are provided under the same license as the WPT monorepo. See https://www.w3.org/Consortium/Legal/2015/software-license .