outline-width property CSS Reference

Definition and Usage

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:

• Initial medium
• Applies to all elements
• Inherited no
• Media visual, interactive
• Computed Value an absolute length; if the keyword none is specified, the computed value is 0
• Animatable yes, as a length
• Canonical order the unique non-ambiguous order defined by the formal grammar

Syntax

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
</length>

Values

thin

Depends on the UA. Typically 1px in desktop browsers like Firefox.

medium

Depends on the UA. Typically 3px in desktop browsers like Firefox.

thick

Depends on the UA. Typically 5px in desktop browsers like Firefox.

<length>

See <length> values.

Examples

thin      medium       thick       2px       1ex               2em

Compatibility

Desktop browsers

Mobile browsers