The <mtext> MathML element is used to render arbitrary text with no notational meaning, such as comments or annotations.
To display text with notational meaning, use <mi>, <mn>, <mo> or <ms> instead.
This element accepts the global MathML attributes.
<math display="block">
<mtext>Theorem of Pythagoras</mtext>
</math>
<math display="block">
<mtext>/* comment here */</mtext>
</math>