Web/CSS/border-inline-start-width

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.

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Syntax

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

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

<'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	a length

Formal syntax

<'border-top-width'>

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;
}

Specifications

Specification	Status	Comment
CSS Logical Properties and Values Level 1The definition of 'border-inline-start-width' in that specification.	Editor's Draft	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`border-inline-start-width`	Chrome Full support 69	Edge Full support 79	Firefox Full support 41 Full support 41 Full support 38 Notes' Disabled' Notes' Enabled by default since Firefox 41. Disabled' From version 38: this feature is behind the `layout.css.vertical-text.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 56	Safari Full support 12.1	WebView Android Full support 69	Chrome Android Full support 69	Firefox Android Full support 41 Full support 41 Full support 38 Notes' Disabled' Notes' Enabled by default since Firefox 41. Disabled' From version 38: this feature is behind the `layout.css.vertical-text.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android Full support 48	Safari iOS Full support 12.2	Samsung Internet Android Full support 10.0

Legend

Full support: Full support
No support: No support
See implementation notes.': See implementation notes.
User must explicitly enable this feature.': User must explicitly enable this feature.