<dimension>

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The <dimension> CSS data type represents a <number> with a unit attached to it, for example 10px.

CSS uses dimensions to specify distances (<length>), durations (<time>), frequencies (<frequency>), resolutions (<resolution>), and other quantities.

Syntax

The syntax of <dimension> is a <number> immediately followed by a unit which is an identifier. Unit identifiers are case insensitive.

Examples

Valid dimensions

12px      12 pixels
1rem      1 rem
1.2pt     1.2 points
2200ms    2200 milliseconds
5s        5 seconds
200hz     200 Hertz
200Hz     200 Hertz (values are case insensitive)

Invalid dimensions

12 px       The unit must come immediately after the number.
12"px"      Units are identifiers and therefore unquoted.
3sec        The seconds unit is abbreviated "s" not "sec".

Specifications

Specification
CSS Values and Units Module Level 4 # dimensions

Browser compatibility

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