ReferenceElement Reference<mdn><mdn> The <mdn> tag is the numbered version of the <md> tag, used for multiline displays of mathematics in which each aligned row will be numbered. Syntax Examples SourcePreview<mdn> <mrow> \det\begin{bmatrix}1\amp 1\\ 1\amp 3\end{bmatrix}\amp = 3-1 </mrow> <mrow> \amp = 2 </mrow> </mdn><mdash><me>