Display:

${\∫}_0^1{\mathrm{\ⅇ}}^x\⁢\ⅆx$

Source:

<mrow>
     <msubsup>
          <mo> &int; </mo>
          <mn> 0 </mn>
          <mn> 1 </mn>
     </msubsup>
     <mrow>
          <msup>
               <mi> &ExponentialE; </mi>
               <mi> x </mi>
          </msup>
          <mo> &InvisibleTimes; </mo>
          <mrow>
               <mo> &DifferentialD; </mo>
               <mi> x </mi>
          </mrow>
     </mrow>
</mrow>