Role of <mlabeledtr>
Creates a table row with a separate label cell. Use the element for its semantic role rather than as a visual styling shortcut. Assistive technology, browser math layout, conversion tools, and copy-and-paste behavior all depend on the markup preserving the mathematical structure.
Example markup
<mlabeledtr><mtd><mtext>(1)</mtext></mtd><mtd><mi>x</mi></mtd></mlabeledtr>Allowed children
label cell followed by content cells
Only place children inside <mlabeledtr> when they match the element's content model. Validate the complete MathML tree after conversion because a locally valid fragment can still be incorrect in its parent context.
Implementation notes
- Useful for numbered equations in table layouts.
Accessibility and testing
- Keep a meaningful DOM structure instead of replacing the expression with an image.
- Test keyboard selection, screen-reader output, browser rendering, and conversion back to LaTeX.
- Check that fallbacks do not expose raw tags or omit the mathematical relationship represented by <mlabeledtr>.