Set the thickness of an element's outline ("outside-the-box" border).
The width of this property does not affect the size of the element, or the size of nearby elements. Wide outlines may cross over nearby elements.
Unlike many other similar properties, the outline-width property does not have corresponding top, right, bottom and left properties. Outline-width rules can only be set for all four sides at once.
Use any of these special keyword values to set the outline width:
|thin||Typically this means 1px, but it's not formally defined as such|
|medium||Typically this means 3px, but it's not formally defined as such|
|think||Typically this means 5px, but it's not formally defined as such|
Or use any of these font-relative typographic units to set the outline width:
|rem||relative em||The |
|lh||line height||The |
|rlh||relative line height||The |
|cap||cap height||The nominal height of the current font's capital letters|
|ex||"x"||The height of the current font's "x" glyph|
|ch||"0"||The advance measure (the width) of the current font's "0" glyph|
|ic||ideograph count||The advance measure (the width) of the current font's "水" ideograph|
Or use any of these fixed size units which are independent of the current font:
|in||inch||A size equal 96px|
|px||pixels||A size equal to 1/96 inch|
|pt||point||A size equal 1in/72 = 1.33px|
|pc||pica||A size equal 1in/6 = 12pt = 16px|
|cm||centimeter||A size equal to 96px/2.54 = 37.8px|
|mm||millimeter||A size equal to 96px/25.4 = 3.8px|
|Q||quarter millimeter||A size equal to 96px/1016 = 0.94px|