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
/* <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 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
<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-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
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See also
- The properties which defines other insets:
inset-block-start,inset-block-end, andinset-inline-end - The mapped physical properties:
top,right,bottom, andleft writing-mode,direction,text-orientation