An mtr element represents one row in a table or matrix. An mtr element is only allowed as a direct sub-expression of an mtable element, and specifies that its contents should form one row of the table. Each argument of mtr is placed in a different column of the table, starting at the leftmost column in a LTR context or rightmost column in a RTL context. MathML Fundamentals
<math mathsize="50">
<mspace linebreak="newline" indentalign="center"></mspace>
<mtext style="border:1px;" mathsize="50">Table Matrix - mtr align</mtext>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext>abc</mtext>
<mo>+</mo>
<mtable style="border:1px" rowalign="center" columnalign="right">
<mtr>
<mtd>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mn>2222</mn>
</mtd>
<mtd>
<mn>3</mn>
</mtd>
</mtr>
<mtr rowalign="top" columnalign="left">
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mn>300</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>1000</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mtd>
</mtr>
</mtable>
</mrow>
</math>