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CSS outline-width Property

The outline-width property sets the width of an element's outline.

An outline is a line that is drawn around an element, outside the borders.

CSS Demo: outline-width

outline-width: 5px;
outline-width: 10px;
outline-width: 1.2em;
outline-width: thin;
outline-width: 25px;
This is a box with an outline around it

Outlines are very similar to borders, but there are few major differences as well:

  • An outline does not take up space
  • Outlines do not have to be rectangular
  • Outline is always the same on all sides; you cannot specify different values for different sides of an element

Technical Details

Default value medium
Applies to all elements
Inherited no
Computed value as specified
Animatable yes See animatable properties. Demo
Version CSS2
JavaScript syntax object.style.outlineWidth = "medium" Demo

CSS Syntax:

outline-width: length|medium|thin|thick|initial|inherit;


The following example shows how to use outline-width property:

Run code

Note: Always declare the outline-style property before the outline-width property. An element must have an outline before you can change the width.

Browser compatibility

The numbers in the table specify the first browser version that fully supports the outline-width property:

outline-width 1 1.5 7 1.2 8

Property Values

The following table describes the values of outline-width property:

Value Description
medium Specifies a medium outline (This is default)
length Defines the width of the outline. See length units
thin Specifies a thin outline
thick Specifies a thick outline
initial Sets this property to its default value
inherit Inherits this property from its parent element

See also

CSS Outline tutorial

CSS outline property

CSS outline-offset property

CSS outline-color property

CSS outline-style property