border-block-start-width
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The border-block-start-width CSS property defines the width of the logical block-start border of an element, which maps to a physical border width depending on the element's writing mode, directionality, and text orientation. It corresponds to the border-top-width, border-right-width, border-bottom-width, or border-left-width property depending on the values defined for writing-mode, direction, and text-orientation.
Try it
Syntax
Related properties are border-block-end-width, border-inline-start-width, and border-inline-end-width, which define the other border widths of the element.
Values
<'border-width'>-
The width of the border. See
border-width.
Formal definition
| Initial value | medium |
|---|---|
| Applies to | all elements |
| Inherited | no |
| Percentages | logical-width of containing block |
| Computed value | absolute length; 0 if the border style is none or hidden |
| Animation type | by computed value type |
Formal syntax
border-block-start-width =
<line-width>
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Examples
Border width with vertical text
HTML
CSS
Results
Specifications
| Specification |
|---|
| CSS Logical Properties and Values Level 1 # border-width |
Browser compatibility
See also
- CSS Logical Properties and Values
- This property maps to one of the physical border properties:
border-top-width,border-right-width,border-bottom-width, andborder-left-width writing-mode,direction,text-orientation