HTML5 MathML
HTML5 MathML <mlabeledtr> Tag
The <mlabeledtr> element is a labelled table row inside an <mtable>. Its first child is the label (for example an equation number) and the remaining children are the ordinary cells of the row.
Definition and Usage
Use <mlabeledtr> in place of <mtr> when a row needs a label - most often to number a displayed equation. The label is placed to one side of the table; the side is controlled by the side attribute on the parent <mtable>.
Syntax
Example
<mlabeledtr>
<mtd><mtext>(1)</mtext></mtd> <!-- label -->
<mtd>...</mtd> <!-- cell -->
</mlabeledtr>Example
This numbers a single equation using a labelled row inside a table.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>MathML mlabeledtr</title>
</head>
<body>
<math display="block">
<mtable>
<mlabeledtr>
<mtd><mtext>(1)</mtext></mtd>
<mtd>
<mrow>
<msup><mi>a</mi><mn>2</mn></msup>
<mo>+</mo>
<msup><mi>b</mi><mn>2</mn></msup>
<mo>=</mo>
<msup><mi>c</mi><mn>2</mn></msup>
</mrow>
</mtd>
</mlabeledtr>
</mtable>
</math>
</body>
</html>⚠️
<mlabeledtr> is not part of the MathML Core baseline and support is limited. For reliable equation numbering, consider a two-column layout or CSS around the <math> element.
Key Takeaways
- <mlabeledtr> is a table row whose first child is a label.
- It is used mainly to number displayed equations.
- Support is limited - test carefully or use a CSS-based alternative.