HTML ( subscript and superscript )

 <!-- subscript and superscript -->

(subscript for use any special equetion as  co2(corban dai oxide) in properly )

    <p>CO <sub>2</sub></p>

( superscript for use any special equetion as ax2+bx+c (math terms) in properly )

    <p>a <sup>2</sup> +bx+c</p>

(for chemical reaction show on web page  , &rarr; (use for errow simble) 

    <p>c+o<sub>2</sub> &rarr; co<sub>2</sub></p>

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