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${\displaystyle 5+23+0.5+5.0+.1+100+\mathrm{0xFFEF}+5+5}$

Source Code:

    <math> 
      <mstyle displaystyle='true'> 
        <mrow> 
          <mn>5</mn> 
          <mo>+</mo> 
          <mn fontweight='bold'>23</mn> 
          <mo>+</mo> 
          <mn fontweight='normal' fontstyle='italic'>0.5 
          </mn> 
          <mo>+</mo> 
          <mn fontstyle='normal'>5.0</mn> 
          <mo>+</mo> 
          <mn fontweight='bold' fontstyle='normal'>.1 
          </mn> 
          <mo>+</mo> 
          <mn color='#9c0fff'>100</mn> 
          <mo>+</mo> 
          <mn color='#0ee'>0xFFEF</mn> 
          <mo>+</mo> 
          <mn color='Green'>5</mn> 
          <mo>+</mo> 
          <mn fontfamily='Helvetica'>5</mn> 
        </mrow> 
      </mstyle> 
    </math>