border-block-start-style

The border-block-start-style CSS property defines the style of the logical block start border 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, border-right-style, border-bottom-style, or border-left-style property depending on the values defined for writing-mode, direction, and text-orientation.

Try it

Syntax

css

/* <'border-style'> values */
border-block-start-style: dashed;
border-block-start-style: dotted;
border-block-start-style: groove;

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

Related properties are border-block-end-style, border-inline-start-style, and border-inline-end-style, which define the other border styles of the element.

Values

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

Formal definition

Initial value	`none`
Applies to	all elements
Inherited	no
Computed value	as specified
Animation type	discrete

Formal syntax

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

Examples

Dashed border with vertical text

HTML

html

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

CSS

css

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

.exampleText {
  writing-mode: vertical-lr;
  border: 5px solid blue;
  border-block-start-style: dashed;
}

Results

Specifications

Specification
CSS Logical Properties and Values Level 1 # border-style

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-start-style`	69	79	41	No	56	12.1	69	69	41	48	12.2	10.0

Docs

Docs4dev

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