HTML5 MathML
HTML5 MathML <mlabeledtr> Tag
The <mlabeledtr> tag is a special table row inside an <mtable> whose first child acts as a label - typically an equation number - placed to one side of the row.
Definition and usage
The <mlabeledtr> element works like <mtr> but reserves its first child cell as a label. The remaining cells form the actual row content. This is commonly used to place a numbered tag, such as (1), beside a numbered equation.
Syntax
<mtable>
<mlabeledtr>
<mtd><!-- label --></mtd>
<mtd><!-- row content --></mtd>
</mlabeledtr>
</mtable>Example
<math display="block">
<mtable>
<mlabeledtr>
<mtd><mtext>(1)</mtext></mtd>
<mtd>
<mrow><mi>a</mi><mo>+</mo><mi>b</mi><mo>=</mo><mi>c</mi></mrow>
</mtd>
</mlabeledtr>
</mtable>
</math>The first <mtd> holds the label (1), and the second holds the equation a + b = c.
⚠️
The <mlabeledtr> element is not part of MathML Core and has poor browser support. For numbered equations, a plain <mtable> with a label cell or CSS is more portable.