inset-inline-start

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

/* <length> values */
inset-inline-start: 3px;
inset-inline-start: 2.4em;

/* <percentage>s of the width or height of the containing block */
inset-inline-start: 10%;

/* Keyword value */
inset-inline-start: auto;

/* Global values */
inset-inline-start: inherit;
inset-inline-start: initial;
inset-inline-start: unset;

The shorthand for inset-inline-start and inset-inline-end is inset-inline.

Syntax

Values

The inset-inline-start property takes the same values as the left property.

Formal definition

Initial valueauto
Applies topositioned elements
Inheritedno
Percentageslogical-width of containing block
Computed valuesame as box offsets: top, right, bottom, left properties except that directions are logical
Animation typea length, percentage or calc();

Formal syntax

<'top'>

Examples

Setting inline start offset

HTML

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

CSS

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

.exampleText {
  writing-mode: vertical-lr;
  position: relative;
  inset-inline-start: 20px;
  background-color: #c8c800;
}

Result

Specifications

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

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
inset-inline-startChrome Full support 69
Disabled
Full support 69
Disabled
Disabled From version 69: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Edge Full support 79
Disabled
Full support 79
Disabled
Disabled From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
Firefox Full support 63
Full support 63
No support 41 — 63
Alternate Name
Alternate Name Uses the non-standard name: offset-inline-start
No support 38 — 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 56
Disabled
Full support 56
Disabled
Disabled From version 56: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
Safari No support NoWebView Android No support NoChrome Android Full support 69
Disabled
Full support 69
Disabled
Disabled From version 69: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Firefox Android Full support 63
Full support 63
No support 41 — 63
Alternate Name
Alternate Name Uses the non-standard name: offset-inline-start
No support 38 — 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 48
Disabled
Full support 48
Disabled
Disabled From version 48: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
Safari iOS No support NoSamsung Internet Android No support No

Legend

Full support
Full support
No support
No support
User must explicitly enable this feature.
User must explicitly enable this feature.
Uses a non-standard name.
Uses a non-standard name.

See also