outline-width
The CSS outline-width
property sets the thickness of an element's outline. An outline is a line that is drawn around an element, outside the border
.
Try it
It is often more convenient to use the shorthand property outline
when defining the appearance of an outline.
Syntax
css
/* Keyword values */
outline-width: thin;
outline-width: medium;
outline-width: thick;
/* <length> values */
outline-width: 1px;
outline-width: 0.1em;
/* Global values */
outline-width: inherit;
outline-width: initial;
outline-width: revert;
outline-width: revert-layer;
outline-width: unset;
The outline-width
property is specified as any one of the values listed below.
Values
<length>
-
The width of the outline specified as a
<length>
. thin
-
Depends on the user agent. Typically equivalent to
1px
in desktop browsers (including Firefox). medium
-
Depends on the user agent. Typically equivalent to
3px
in desktop browsers (including Firefox). thick
-
Depends on the user agent. Typically equivalent to
5px
in desktop browsers (including Firefox).
Formal definition
Initial value | medium |
---|---|
Applies to | all elements |
Inherited | no |
Computed value | an absolute length; if the keyword none is specified, the computed value is 0 |
Animation type | a length |
Formal syntax
outline-width =
<line-width>
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Examples
Setting an element's outline width
HTML
html
<span id="thin">thin</span>
<span id="medium">medium</span>
<span id="thick">thick</span>
<span id="twopixels">2px</span>
<span id="oneex">1ex</span>
<span id="em">1.2em</span>
CSS
css
span {
outline-style: solid;
display: inline-block;
margin: 20px;
}
#thin {
outline-width: thin;
}
#medium {
outline-width: medium;
}
#thick {
outline-width: thick;
}
#twopixels {
outline-width: 2px;
}
#oneex {
outline-width: 1ex;
}
#em {
outline-width: 1.2em;
}
Result
Specifications
Specification |
---|
CSS Basic User Interface Module Level 4 # outline-width |
Browser compatibility
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