CSS · Properties — CSS Basic User Interface
outline-width
The CSS outline-width property. Initial value: medium. Not inherited.
Syntax
outline-width: <line-width>Example
Try it
Notes
Media: visual,interactive. Applies to: allElements. Computed value: absoluteLengthSnappedAsLineWidth.
More in this group
Learn this in the course
Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.