In addition to the attributes defined for all presentation elements, MathML includes two mathematics style attributes (mathvariant, mathsize) as well as a directionality attribute (dir) valid on all presentation token elements. MathML Fundamentals
<math mathsize="100">
<mspace linebreak="newline" indentalign="center"></mspace>
<mtext style="border:1px;" mathsize="big">Style attributes common to token elements</mtext>
<mspace linebreak="newline" indentalign="center"></mspace>
<mtext style="border:1px;" mathsize="normal">Style attributes common to token elements</mtext>
<mspace linebreak="newline" indentalign="center"></mspace>
<mtext style="border:1px;" mathsize="small">Style attributes common to token elements</mtext>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="normal">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold-italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="double-struck">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="double-struck-italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold-double-struck">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="double-struck-bold-italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="fraktur">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold-fraktur">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="script">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold-script">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="sans-serif">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="bold-sans-serif">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="sans-serif-italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="sans-serif-bold-italic">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathvariant="monospace">ABCDEFGHIJKLMNOPQRSTUVXYZWabcdefghijklmnopqrstuvxyzw0123456789</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;">
<mtext mathsize="50">ABC</mtext>
<mtext mathsize="100">ABC</mtext>
<mtext mathsize="150">ABC</mtext>
<mtext mathsize="200">ABC</mtext>
</mrow>
<mspace linebreak="newline" indentalign="center"></mspace>
<mrow style="border:1px;" dir="rtl">
<mtext mathsize="50">ABC</mtext>
<mtext mathsize="100">ABC</mtext>
<mtext mathsize="150">ABC</mtext>
<mtext mathsize="200">ABC</mtext>
</mrow>
</math>