border-inline-start-width CSS property

The border-inline-start-width CSS property defines the width of the logical inline-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

border-inline-start-width: thick;
writing-mode: horizontal-tb;
border-inline-start-width: thick;
writing-mode: vertical-rl;
border-inline-start-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;
}

Syntax

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

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

Related properties are border-block-start-width, border-block-end-width, and border-inline-end-width, which define the other border widths of the element.

Values

<line-width>

Defines the width of the border, either as an explicit non-negative <length> or the keywords: thin, medium, or thick. The default is medium.

Formal definition

Initial valuemedium
Applies toall elements
Inheritedno
Computed valuethe absolute <length>, snapped as a line width
Animation typeby computed value type

Formal syntax

border-inline-start-width = 
  <line-width>  

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

Examples

undefined

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-start-width: 5px;
}

Specifications

See also