The <mtr> MathML element represents a row in a table or a matrix. It may only appear in a <mtable> element and its children are <mtd> elements representing cells. This element is similar to the <tr> element of HTML.
This element's attributes include the global MathML attributes. Some browsers may also support the following attributes:
columnalign Overrides the horizontal alignment of cells specified by <mtable> for this row. Multiple values separated by space are allowed and apply to the corresponding columns (e.g., columnalign="left center right"). Possible values are: left, center and right.
rowalign Overrides the vertical alignment of cells specified by <mtable> for this row. Possible values are: axis, baseline, bottom, center and top.