An msrow represents a row in an mstack. In most cases it is implied by the context, but is useful explicitly for putting multiple elements in a single row, such as when placing an operator "+" or "-" alongside a number within an addition or subtraction. MathML Fundamentals
<math > <mspace linebreak="newline" indentalign="center"></mspace> <mtext style="border:1px;" mathsize="50">Msrow - position</mtext> <mspace linebreak="newline" indentalign="center"></mspace> <mrow style="border:1px;margin:5px" axis="true" > <mstack style="border:1px;margin:3px"> <msgroup> <mn>133</mn> <msrow><mo>×</mo><mn>321</mn></msrow> </msgroup> <msline/> <msrow><mn>123</mn></msrow> <msrow position="1"><mn>246</mn></msrow> <msrow position="2"><mn>369</mn></msrow> <msline/> </mstack> </mrow> </math>