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border-width
The border-width shorthand CSS property sets the width of an element's border.
| Initial value | as each of the properties of the shorthand:border-top-width: mediumborder-right-width: mediumborder-bottom-width: mediumborder-left-width: medium |
| Applies to | all elements. It also applies to ::first-letter. |
Syntax
border-width: 1em;
Values
Defines the width of the border, either as an explicit nonnegative or a keyword. If it's a keyword, it must be one of the following values:
thin
A thin border
medium
A medium border
thick
A thick border
Note: Because the specification doesn't define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern thin ≤ medium ≤ thick, and the values are constant within a single document.
Browser support
| border-width | chrome1 | edge12 | firefox1 | ie4 | opera3.5 | safari1 |