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<mroot> - MathML | MDN
<mroot> Baseline Widely available
The <mroot>MathML element is used to display roots with an explicit index. Two arguments are accepted, which leads to the syntax: <mroot> base index </mroot>.
<math display="block">
<mroot>
<mi>x</mi>
<mn>3</mn>
</mroot>
</math>
<msqrt>
