MathML Demo: <mmultiscripts> - attach prescripts and tensor indices to a base

A MathML mmultiscripts object allows you to build tensor-like objects. For example ${}_a{}^{b}M_c^d$. The scripts come in pairs, with <mprescripts/> used to indicate prescripts and <none/> used to hold an empty position as in ${}_{a}F^b$. There are some variations possible: <mmultiscripts> $A_a^b{}_c{}^d$, nested <msubsup>s ${A_a^b}_c^d$, or ⁣ $A_{ac}^{bd}$.

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A MathML mmultiscripts objects allows you to build tensor-like objects. For example $${\displaystyle {}_a{}^{b}M_c^d}$$ The scripts come in pairs, with <mprescripts/> used to indicate prescripts and <none/> used to hold an empty position as in $${\displaystyle {}_{a}F^b}$$There are some variations possible: <mmultiscripts> $${\displaystyle A_a^b{}_c{}^d}$$nested <msubsup>s $${\displaystyle {A_a^b}_c^d}$$or ⁣ $${\displaystyle A_{ac}^{bd}}$$