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  2. CSS
  3. inset-inline-start

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 ⁨April 2021⁩.

* Some parts of this feature may have varying levels of support.

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

writing-mode: horizontal-tb; 
writing-mode: vertical-rl; 
writing-mode: horizontal-tb; direction: rtl; 
writing-mode: vertical-lr; 
<section id="default-example"> <div class="example-container" id="example-element"> <div id="abspos"> I am absolutely positioned with inset-inline-start: 50px </div> <p> As much mud in the streets as if the waters had but newly retired from the face of the earth, and it would not be wonderful to meet a Megalosaurus, forty feet long or so, waddling like an elephantine lizard up Holborn Hill. </p> </div> </section> 
#example-element { border: 0.75em solid; padding: 0.75em; position: relative; width: 100%; min-height: 200px; unicode-bidi: bidi-override; } #abspos { background-color: yellow; color: black; border: 3px solid red; position: absolute; inset-inline-start: 50px; inline-size: 140px; min-block-size: 80px; }

Syntax

css
/* <length> values */ inset-inline-start: 3px; inset-inline-start: 2.4em; inset-inline-start: calc(anchor(--my-anchor 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 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

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
# propdef-inset-inline-start
CSS Positioned Layout Module Level 3
# propdef-inset-inline-start

Browser compatibility

See also

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