The <sub> element

The text inside <sub>..</sub> element is rendered with <i>subscript<i> text style.

snippet
<html>
<head></head>
<body>
The formula for glucose is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>
<body>
<html>

Output
The formula for glucose is C6H12O6
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