inset-inline-start

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

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.

This inset property has no effect on non-positioned elements.

Try it

Syntax

css

/* <length> values */
inset-inline-start: 3px;
inset-inline-start: 2.4em;
inset-inline-start: calc(anchor(--myAnchor 50%) + 10px);
inset-inline-start: anchor-size(width);

/* <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: revert;
inset-inline-start: revert-layer;
inset-inline-start: unset;

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

Values

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

Formal definition

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

Formal syntax

inset-inline-start = 
  auto                 |
  <length-percentage>  

<length-percentage> = 
  <length>      |
  <percentage>

Examples

Setting inline start offset

HTML

html

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

CSS

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
CSS Logical Properties and Values Level 1 # position-properties

Browser compatibility

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