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border-block

The border-block CSS property is a shorthand property for setting the individual logical block border property values in a single place in the style sheet.

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border-block can be used to set the values for one or more of border-block-width, border-block-style, and border-block-color setting both the start and end in the block dimension at once. The physical borders to which it maps depends on the element's writing mode, directionality, and text orientation. It corresponds to the border-top and border-bottom or border-right, and border-left properties depending on the values defined for writing-mode, direction, and text-orientation.

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

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

border-block: 1px;
border-block: 2px dotted;
border-block: medium dashed blue;

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

Values

The border-block is specified with one or more of the following, in any order:

<'border-width'>: The width of the border. See border-width.
<'border-style'>: The line style of the border. See border-style.
<color>: The color of the border.

Formal definition

Initial value	as each of the properties of the shorthand: `border-block-width`: `medium` `border-block-style`: `none` `border-block-color`: `currentcolor`
Applies to	all elements
Inherited	no
Computed value	as each of the properties of the shorthand: `border-block-width`: absolute length; `0` if the border style is `none` or `hidden` `border-block-style`: as specified `border-block-color`: computed color
Animation type	discrete

Formal syntax

border-block = 
  <'border-block-start'>

Examples

Border with vertical text

HTML

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

CSS

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

.exampleText {
  writing-mode: vertical-rl;
  border-block: 5px dashed blue;
}

Results

Specifications

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

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`border-block`	87	87	66	No	73	14.1	87	87	66	62	14.5	14.0