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

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

Initial valuenone
Applies toall elements
Computed valueas specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* border-inline-start-style: style */
border-inline-start-style: dashed;

/* border-inline-start-style: horizontal vertical */
border-inline-start-style: dotted solid;

/* border-inline-start-style: top horizontal bottom */
border-inline-start-style: hidden double dashed; 

/* border-inline-start-style: top right bottom left */
border-inline-start-style: none solid dotted dashed; 

border-inline-start-style: inherit


See border-style

Formal syntax



HTML Content

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

CSS Content

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

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


Specification Status Comment
CSS Logical Properties Level 1
The definition of 'border-inline-start-style' 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][2] 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][2] Not supported Not supported Not supported

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

[2] Before Gecko 38, and after it, is available in a prefixed version, with a slightly different name, -moz-border-end-color.

See also

Document Tags and Contributors

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