HTML <sub> tag
Browser Support
All major browsers support <sub> tag.
Tag definitions and instructions
<Sub> tag defines subscript text. Subscript text will be displayed below the character is half the height of the reference line in the current text flow, but with the current text flow of text fonts and sizes are the same. Subscript text can be used to represent chemical formulas, such as H 2 O.
Tip: Use <sup> tag defines superscript text.
Differences between HTML 4.01 and HTML5
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Global Properties
<sub> tag supports HTML global properties .
Event Properties
<sub> tag supports HTML event properties .