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inset-block

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.

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Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* <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: revert;
inset-block: revert-layer;
inset-block: unset;

Values

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

Formal definition

Initial value	as each of the properties of the shorthand: `inset-block-start`: `auto` `inset-block-end`: `auto`
Applies to	positioned elements
Inherited	no
Percentages	logical-height of containing block
Computed value	as each of the properties of the shorthand: `inset-block-start`: same as box offsets: `top`, `right`, `bottom`, `left` properties except that directions are logical `inset-block-end`: same as box offsets: `top`, `right`, `bottom`, `left` properties except that directions are logical
Animation type	a length, percentage or calc();

Formal syntax

inset-block = 
  <top>{1,2}

Examples

Setting block start and end offsets

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-block: 20px 50px;
  background-color: #c8c800;
}

Result

Specifications

Specification
CSS Logical Properties and Values Level 1 # propdef-inset-block

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`inset-block`	87	87	6341–63	No	73	14.1	87	87	6341–63	62	14.5	14.0