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css property

`border-inline-start-width` CSS property

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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.

Interactive exampleOpen the canonical MDN source to run this embedded demo.
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

/* <'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

  • &lt;line-width&gt;
    • : Defines the width of the border, either as an explicit non-negative &lt;length&gt; or the keywords: thin, medium, or thick. The default is medium.

Formal definition

Formal syntax

Examples

HTML

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

CSS

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

.exampleText {
  writing-mode: vertical-lr;
  border: 1px solid blue;
  border-inline-start-width: 5px;
}
Interactive exampleOpen the canonical MDN source to run this embedded demo.

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also