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  5. border-inline-width

border-inline-width

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨April 2021⁩.

The border-inline-width CSS property defines the width of the logical inline borders 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 and border-bottom-width, or border-left-width, and border-right-width property depending on the values defined for writing-mode, direction, and text-orientation.

Try it

border-inline-width: thick;
writing-mode: horizontal-tb;

border-inline-width: thick;
writing-mode: vertical-rl;

border-inline-width: 4px;
writing-mode: horizontal-tb;
direction: rtl;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with a border around it.
  </div>
</section>

#example-element {
  background-color: palegreen;
  color: black;
  border: 0 solid crimson;
  padding: 0.75em;
  width: 80%;
  height: 100px;
  unicode-bidi: bidi-override;
}

The border width in the other dimension can be set with border-block-width, which sets border-block-start-width, and border-block-end-width.

Syntax

css
/* <'border-width'> values */
border-inline-width: 5px 10px;
border-inline-width: 5px;
border-inline-width: thick;

/* Global values */
border-inline-width: inherit;
border-inline-width: initial;
border-inline-width: revert;
border-inline-width: revert-layer;
border-inline-width: unset;

Values

<'border-width'>

The width of the border. See border-width.

Formal definition

Initial valuemedium
Applies toall elements
Inheritedno
Percentageslogical-width of containing block
Computed valueabsolute length; 0 if the border style is none or hidden
Animation typeby computed value type

Formal syntax

border-inline-width = 
  <'border-top-width'>{1,2}  

<border-top-width> = 
  <line-width>  

<line-width> = 
  <length [0,∞]>  |
  thin            |
  medium          |
  thick

Examples

HTML

html
<div>
  <p class="exampleText">Example text</p>
</div>

CSS

css
div {
  background-color: yellow;
  width: 120px;
  height: 120px;
}

.exampleText {
  writing-mode: vertical-lr;
  border: 1px solid blue;
  border-inline-width: 5px 10px;
}

Specifications

Specification
CSS Logical Properties and Values Level 1
# propdef-border-inline-width

Browser compatibility

See also

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