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dimension

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 Status Comment
CSS Values and Units Module Level 4
The definition of '<dimension>' in that specification.
Editor's Draft Adds cap, ic, lh, rlh, vi, vb
CSS Values and Units Module Level 3
The definition of '<dimension>' in that specification.
Candidate Recommendation Adds ch, rem, vw, vw, vmin, vmax, Q
CSS Level 2 (Revision 1)
The definition of '<dimension>' in that specification.
Recommendation Defined under Numbers and Length
CSS Level 1
The definition of '<dimension>' in that specification.
Recommendation Initial definition under "length units"

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
<dimension> 1 12 1 5 3.5 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
<dimension> ≤37 18 4 10.1 1 1.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/dimension