border-top-width
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The border-top-width CSS property sets the width of the top border of an element.
Try it
Syntax
Values
<line-width>-
Defines the width of the border, either as an explicit nonnegative
<length>or a keyword. If it's a keyword, it must be one of the following values:thinmediumthick
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.
Formal definition
| Initial value | medium |
|---|---|
| Applies to | all elements. It also applies to ::first-letter. |
| Inherited | no |
| Computed value | the absolute length or 0 if border-top-style is none or hidden |
| Animation type | a length |
Formal syntax
border-top-width =
<line-width>
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Examples
HTML
CSS
Result
Specifications
| Specification |
|---|
| CSS Backgrounds and Borders Module Level 3 # border-width |
Browser compatibility
See also
- The other border-width-related CSS properties:
border-left-width,border-right-width,border-bottom-width, andborder-width. - The other border-top-related CSS properties:
border,border-top,border-top-style, andborder-top-color.