`border-block-style` CSS property

The border-block-style CSS property defines the style of the logical block borders of an element, which maps to a physical border style depending on the element's writing mode, directionality, and text orientation. It corresponds to the border-top-style and border-bottom-style, or border-left-style and border-right-style properties depending on the values defined for writing-mode, direction, and text-orientation.

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

Try it

border-block-style: dotted;
writing-mode: horizontal-tb;

border-block-style: dotted;
writing-mode: vertical-rl;

border-block-style: groove;
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: #eeeeee;
  color: black;
  border: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
  unicode-bidi: bidi-override;
}

Syntax

/* Keyword values */
border-block-style: dashed;
border-block-style: dotted;
border-block-style: groove;

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

Values

<line-style>

The line style of the border. See border-style.

Formal definition

Formal syntax

border-block-style = 
  <'border-top-style'>{1,2}

Examples

Dashed 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-lr;
  border: 5px solid blue;
  border-block-style: dashed;
}

Results

Specifications

Browser compatibility

See also

• CSS Logical Properties and Values
• This property maps to one of the physical border properties: border-top-style, border-right-style, border-bottom-style, or border-left-style.
• writing-mode, direction, text-orientation