This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.


The border-inline-start CSS property is a shorthand property for setting the individual logical inline start border property values in a single place in the style sheet. border-inline-start can be used to set the values for one or more of: border-inline-start-width, border-inline-start-style, border-inline-start-color. It maps to a physical border depending on the element's writing mode, directionality, and text orientation. It corresponds to the border-topborder-rightborder-bottom, or border-left property depending on the values defined for writing-mode, direction, and text-orientation.

It relates to border-block-start, border-block-end, and border-inline-end, which define the other borders of the element.

Initial valueas each of the properties of the shorthand:
Applies toall elements
Computed valueas each of the properties of the shorthand:
Canonical orderthe unique non-ambiguous order defined by the formal grammar


border-inline-start: 1px;
border-inline-start: 2px dotted;
border-inline-start: medium dashed green;


One or more of the following, in any order:

See border-width
See border-style
See color

Formal syntax

<'border-width'> || <'border-style'> || <'color'>

<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>

<rgb()> = rgb( <rgb-component>#{3} )
<rgba()> = rgba( <rgb-component>#{3} , <alpha-value> )
<hsl()> = hsl( <hue>, <percentage>, <percentage> )
<hsla()> = hsla( <hue>, <percentage>, <percentage>, <alpha-value> )
<named-color> = <ident>
<deprecated-system-color> = ActiveBorder | ActiveCaption | AppWorkspace | Background | ButtonFace | ButtonHighlight | ButtonShadow | ButtonText | CaptionText | GrayText | Highlight | HighlightText | InactiveBorder | InactiveCaption | InactiveCaptionText | InfoBackground | InfoText | Menu | MenuText | Scrollbar | ThreeDDarkShadow | ThreeDFace | ThreeDHighlight | ThreeDLightShadow | ThreeDShadow | Window | WindowFrame | WindowText

<rgb-component> = <integer> | <percentage>
<alpha-value> = <number>
<hue> = <number>


HTML Content

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

CSS Content

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

.exampleText {
  writing-mode: vertical-rl;
  border-inline-start: 5px dashed blue;


Specification Status Comment
CSS Logical Properties Level 1
The definition of 'border-inline-start' in that specification.
Editor's Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported

[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default.

See also

Document Tags and Contributors

 Contributors to this page: Sebastianz, fscholz, teoli, jsx, kscarfone
 Last updated by: Sebastianz,