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---
title: outline-width
slug: Web/CSS/outline-width
page-type: css-property
browser-compat: css.properties.outline-width
---
{{CSSRef}}
The [CSS](/en-US/docs/Web/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 {{cssxref("border")}}.
{{EmbedInteractiveExample("pages/css/outline-width.html")}}
It is often more convenient to use the shorthand property {{cssxref("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
- {{cssxref("<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
{{cssinfo}}
## Formal syntax
{{csssyntax}}
## 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
{{EmbedLiveSample('Setting_an_elements_outline_width', '100%', '80')}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{cssxref("outline")}}
- {{cssxref("outline-color")}}
- {{cssxref("outline-style")}}