max-inline-size

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 max-inline-size CSS property defines the horizontal or vertical maximum size of an element's block, depending on its writing mode. It corresponds to either the max-width or the max-height property, depending on the value of writing-mode.

If the writing mode is vertically oriented, the value of max-inline-size relates to the maximal height of the element; otherwise, it relates to the maximal width of the element. A related property is max-block-size, which defines the other dimension of the element.

Try it

Syntax

css
/* <length> values */
max-inline-size: 300px;
max-inline-size: 25em;
max-inline-size: anchor-size(width);
max-inline-size: anchor-size(--myAnchor self-block, 200px);

/* <percentage> values */
max-inline-size: 75%;

/* Keyword values */
max-inline-size: none;
max-inline-size: max-content;
max-inline-size: min-content;
max-inline-size: fit-content;
max-inline-size: fit-content(20em);

/* Global values */
max-inline-size: inherit;
max-inline-size: initial;
max-inline-size: revert;
max-inline-size: revert-layer;
max-inline-size: unset;

Values

The max-inline-size property takes the same values as the max-width and max-height properties.

Formal definition

Initial valuenone
Applies tosame as width and height
Inheritedno
Percentagesinline-size of containing block
Computed valuesame as max-width and max-height
Animation typea length, percentage or calc();

Formal syntax

max-inline-size = 
<'max-width'>

<max-width> =
none |
<length-percentage [0,∞]> |
min-content |
max-content |
fit-content( <length-percentage [0,∞]> ) |
<calc-size()> |
<anchor-size()>

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

<calc-size()> =
calc-size( <calc-size-basis> , <calc-sum> )

<anchor-size()> =
anchor-size( [ <anchor-element> || <anchor-size> ]? , <length-percentage>? )

<calc-size-basis> =
<intrinsic-size-keyword> |
<calc-size()> |
any |
<calc-sum>

<calc-sum> =
<calc-product> [ [ '+' | '-' ] <calc-product> ]*

<anchor-element> =
<dashed-ident>

<anchor-size> =
width |
height |
block |
inline |
self-block |
self-inline

<calc-product> =
<calc-value> [ [ '*' | '/' ] <calc-value> ]*

<calc-value> =
<number> |
<dimension> |
<percentage> |
<calc-keyword> |
( <calc-sum> )

<calc-keyword> =
e |
pi |
infinity |
-infinity |
NaN

Examples

Setting maximum inline size in pixels

HTML

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

CSS

css
.exampleText {
  writing-mode: vertical-rl;
  background-color: yellow;
  block-size: 100%;
  max-inline-size: 200px;
}

Result

Specifications

Specification
CSS Logical Properties and Values Level 1
# propdef-max-inline-size
CSS Box Sizing Module Level 4
# sizing-values

Browser compatibility

BCD tables only load in the browser

See also