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 September 2021.

The border-inline-widthCSS 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: #000; 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 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-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