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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

/* <length> values */
inset-block: 3px 10px;
inset-block: 2.4em 3em;
inset-block: 10px; /* value applied to start and end */

/* <percentage>s of the width or height of the containing block */
inset-block: 10% 5%;

/* Keyword value */
inset-block: auto;

/* Global values */
inset-block: inherit;
inset-block: initial;
inset-block: unset;

The shorthand for the other dimension is  inset-inline, which is a shorthand for inset-inline-start, and inset-inline-end.

Initial valueauto
Applies topositioned elements
Inheritedno
Percentageslogical-height of containing block
Mediavisual
Computed valuesame as box offsets: top, right, bottom, left properties except that directions are logical
Animation typea length, percentage or calc();
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

Values

The inset-block property takes the same values as the left property.

Formal syntax

<'top'>{1,2}

Example

HTML Content

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

CSS Content

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

.exampleText {
  writing-mode: vertical-lr;
  position: relative;
  inset-block: 20px 50px;
  background-color: #c8c800;
}

Specification

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
inset-block
Experimental
Chrome 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 No support NoFirefox Full support 63
Full support 63
No support 41 — 63
Alternate Name
Alternate Name Uses the non-standard name: offset-block
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-block
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
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.
Uses a non-standard name.
Uses a non-standard name.

See also

Tag Dokumen dan Penyumbang

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