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-inline: 3px 10px;
inset-inline: 2.4em 3em;
inset-inline: 10px; /* value applied to start and end */

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

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

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

Constituent properties

This property is a shorthand for the following CSS properties:



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

Formal definition

Initial valueauto
Applies topositioned elements
Percentageslogical-height 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



Setting block start and end offsets


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


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

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



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

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See also