We're looking for a user researcher to understand the needs of developers and designers. Is this you or someone you know? Check out the post: https://mzl.la/2IGzdXS

outline-width Redirect 1


The outline-width CSS property is used to set the width of the outline of an element. An outline is a line that is drawn around elements, outside the border edge, to make the element stand out:


Formal syntax: <br-width>
outline-width: thin
outline-width: medium
outline-width: thick

outline-width: 1px     /* <length> values */
outline-width: 0.1em

outline-width: inherit


Depends on the UA. Typically 1px in desktop browsers like Firefox.
Depends on the UA. Typically 3px in desktop browsers like Firefox.
Depends on the UA. Typically 5px in desktop browsers like Firefox.
See <length> values.


thin   medium    thick    2px    1ex      2em


Specification Status Comment
CSS Basic User Interface Module Level 3 Working Draft No change.
CSS Transitions Working Draft Defines outline-width as animatable.
CSS Level 2 (Revision 1) Recommendation  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support  1.0 1.5 (1.8) [*] 8.0 7.0 1.2 (125)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? ? ? ? ?

In browsers previous to Gecko 1.8 (Firefox 1.5) essentially the same effect can be achieved using Mozilla CSS Extension -moz-outline-width.

See also

Document Tags and Contributors

Last updated by: Sheppy,