h4 tag
<h4>Hi</h4>how to write h2so4 using html css
html<p>
H<sub>2</sup>0 - Water<br />
O<sub>2</sub> - Oxygen<br />
CO<sub>2</sub> - Carbon dioxide<br />
H<sub>2</sub>SO<sub>4</sub> - Sulfuric acid
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