sub (HTML element)

Spec
Depr. Empty Version
No No HTML 2
Browser support (more…)
IE5.5+ FF1+ SA1.3+ OP9.2+ CH2+
Full Full Full Full Full

Syntax

<sub>
</sub>

Description

The sub element is used to define subscript—text which appears half a character’s height below the baseline of the line it’s on, and is most often used in mathematical or chemical formulae.

The example HTML, where the number 2 is defined as subscript, would render on screen as shown in Figure 1.

Figure 1. An example of sub Example of sub element

Example

Here’s an example of the sub element used for chemical formulas:

<p>That's not just water. That's not just H<sub>2</sub>O. That's
    H<sub>2</sub>-woah!</p>

Use This For …

This element can be applied to any text content, but is likely to be limited to scientific or niche content.

Compatibility

Internet Explorer Firefox Safari Opera Chrome
5.5 6.0 7.0 8.0 1.0 1.5 2.0 3.0 3.5 1.3 2.0 3.1 4.0 9.2 9.5 10.0 2.0
Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full

The sub element enjoys good browser support.

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