Summary

Adds a new MathJax4 plugin that supports MathJax 4.0.0 with proper async startup handling.

Changes

• ✅ New plugin: plugin/math/mathjax4.js with MathJax 4.0.0 support
• ✅ Updated plugin wrapper: Added MathJax4 to plugin/math/plugin.js exports
• ✅ Example updated: examples/math.html now demonstrates MathJax4 configuration
• ✅ Tests added: Comprehensive test suite in test/test-mathjax4.html (all passing)
• ✅ Built files: Updated math.js and math.esm.js with new plugin
• ✅ Version bump: Package version updated to 5.2.2

Key Features

• MathJax 4.0.0 Support: Uses latest MathJax CDN with async startup
• Macros Support: Compatible macro configuration similar to MathJax3
• Async Startup: Proper handling of MathJax 4's async initialization
• Slide Change Support: Re-typesets math when slides become visible
• Backward Compatible: Same API as other math plugins

Configuration Example

mathjax4: {
    tex: {
        inlineMath: [['$', '$'], ['\\(', '\\)']],
        displayMath: [['$$', '$$'], ['\\[', '\\]']],
        macros: {
            R: '\\mathbb{R}',
            set: ['\\left\\{#1 \\; ; \\; #2\\right\\}', 2]
        }
    },
    options: {
        skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
    },
    output: {
        font: 'mathjax-stix2',
        displayOverflow: 'linebreak',
        linebreaks: {
            inline: true,
            width: '100%',
            lineleading: .2
        }
    }
}

Testing

• ✅ QUnit Tests: All 5 tests passing in test/test-mathjax4.html
  • Plugin availability and structure ✅
  • Plugin initialization ✅
  • MathJax 4.0.0 loading and math processing ✅
  • Custom macros functionality ✅
• ✅ Manual Verification: Tested examples/math.html with HTTP server
• ✅ Math Rendering: Verified inline and display math render correctly
• ✅ Macros: Confirmed custom macros (R, set) work as expected
• ✅ Async Startup: Confirmed proper handling of MathJax 4's async initialization
• ✅ Slide Changes: Verified math re-renders when navigating slides

Browser Compatibility

Tested on modern browsers that support MathJax 4.0.0.