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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.

Try it

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:
Applies to all elements
Inherited no
Computed value as each of the properties of the shorthand:
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

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

See also

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https://developer.mozilla.org/en-US/docs/Web/CSS/border-block