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CSS Reference

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CSS Properties

accent-color align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function aspect-ratio backdrop-filter backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-position-x background-position-y background-repeat background-size block-size border border-block border-block-color border-block-end border-block-end-color border-block-end-style border-block-end-width border-block-start border-block-start-color border-block-start-style border-block-start-width border-block-style border-block-width border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-end-end-radius border-end-start-radius border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-inline border-inline-color border-inline-end border-inline-end-color border-inline-end-style border-inline-end-width border-inline-start border-inline-start-color border-inline-start-style border-inline-start-width border-inline-style border-inline-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-start-end-radius border-start-start-radius border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-decoration-break box-reflect box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset counter-set cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-feature-settings font-kerning font-size font-size-adjust font-stretch font-style font-variant font-variant-caps font-weight gap grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-gap grid-column-start grid-gap grid-row grid-row-end grid-row-gap grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens hyphenate-character image-rendering @import inline-size inset inset-block inset-block-end inset-block-start inset-inline inset-inline-end inset-inline-start isolation justify-content justify-items justify-self @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-block margin-block-end margin-block-start margin-bottom margin-inline margin-inline-end margin-inline-start margin-left margin-right margin-top mask-image mask-mode mask-origin mask-position mask-repeat mask-size max-block-size max-height max-inline-size max-width @media min-block-size min-inline-size min-height min-width mix-blend-mode object-fit object-position offset offset-anchor offset-distance offset-path offset-rotate opacity order orphans outline outline-color outline-offset outline-style outline-width overflow overflow-anchor overflow-wrap overflow-x overflow-y overscroll-behavior overscroll-behavior-block overscroll-behavior-inline overscroll-behavior-x overscroll-behavior-y padding padding-block padding-block-end padding-block-start padding-bottom padding-inline padding-inline-end padding-inline-start padding-left padding-right padding-top page-break-after page-break-before page-break-inside paint-order perspective perspective-origin place-content place-items place-self pointer-events position quotes resize right rotate row-gap scale scroll-behavior scroll-margin scroll-margin-block scroll-margin-block-end scroll-margin-block-start scroll-margin-bottom scroll-margin-inline scroll-margin-inline-end scroll-margin-inline-start scroll-margin-left scroll-margin-right scroll-margin-top scroll-padding scroll-padding-block scroll-padding-block-end scroll-padding-block-start scroll-padding-bottom scroll-padding-inline scroll-padding-inline-end scroll-padding-inline-start scroll-padding-left scroll-padding-right scroll-padding-top scroll-snap-align scroll-snap-stop scroll-snap-type scrollbar-color tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-decoration-thickness text-emphasis text-emphasis-color text-emphasis-position text-emphasis-style text-indent text-justify text-orientation text-overflow text-shadow text-transform text-underline-offset text-underline-position top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function translate unicode-bidi user-select vertical-align visibility white-space widows width word-break word-spacing word-wrap writing-mode z-index



CSS border-block-width Property


Example

Set a width for the borders in block direction:

#example1 {
  border-block-style: solid;
  border-block-width: 10px;
}

#example2 {
  border-block-style: solid;
  border-block-width: thin thick;
}
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The border-block-width property sets the width of an element's borders in the block direction.

Note: For the border-block-width property to take effect, the border-block-style must be set.

Values for the border-block-width property can be set in different ways:

If the border-block-width property has two values:

  • border-block-width: 10px 50px;
    • border width at block start is 10px
    • border width at block end is 50px

If the border-block-width property has one value:

  • border-block-width: 10px;
    • border width at block start and end is 10px

The CSS border-block-width property is very similar to CSS properties border-bottom-width, border-left-width, border-right-width and border-top-width, but the border-block-width property is dependent on block direction.

Note: The related CSS property writing-mode defines block direction. This affects where the start and end of a block is and the result of the border-block-width property. For pages in English, inline direction is left to right and block direction is downward.

Show demo ❯

Default value: medium
Inherited: no
Animatable: yes. Read about animatable Try it
Version: CSS3
JavaScript syntax: object.style.borderBlockWidth="3px 10px" Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Property
border-block-width 87.0 87.0 66.0 14.1 73.0


CSS Syntax

border-block-width: medium|thin|thick|length|initial|inherit;

Property Values

Value Description Demo
medium Specifies a medium border. This is default Demo ❯
thin Specifies a thin border Demo ❯
thick Specifies a thick border Demo ❯
length Allows you to define the thickness of the border. Read about length units Demo ❯
initial Sets this property to its default value. Read about initial
inherit Inherits this property from its parent element. Read about inherit

More Examples

With writing-mode property

The position of the borders at the start and end in the block direction is affected by the writing-mode property:

div {
  border-block-style: solid;
  writing-mode: vertical-rl;
  border-block-width: 5px;
}
Try it Yourself »

Related Pages

CSS tutorial: CSS Border

CSS border property: CSS Border property

CSS border-block property: CSS Border-block property

CSS border-block-end-width property: CSS Border-block-end-width property

CSS border-block-start-width property: CSS Border-block-start-width property

CSS border-block-style property: CSS Border-block-style property

CSS border-bottom-width property: CSS Border-bottom-width property

CSS border-left-width property: CSS Border-left-width property

CSS border-right-width property: CSS Border-right-width property

CSS border-top-width property: CSS Border-top-width property

CSS writing-mode property: CSS Writing-mode property