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

/* <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 value	`none`
Applies to	same as `width` and `height`
Inherited	no
Percentages	inline-size of containing block
Computed value	same as `max-width` and `max-height`
Animation type	a 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-name> || <anchor-size> ]? , <length-percentage>? )  

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

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

<anchor-name> = 
  <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

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

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

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android
`max-inline-size`	57	79	41	44	12.110.1	57	41	43	12.210.3	7.0	57
`anchor-size`	125	125	No	111	No	125	No	83	No	27.0	125
`fit-content`	57	79	9441	44	12.1	57	9441	43	12.2	7.0	57
`fit-content_function`	No	No	91	No	No	No	No	No	No	No	No
`max-content`	57	79	6641	44	12.1	57	6641	43	12.2	7.0	57
`min-content`	57	79	6641	44	12.1	57	6641	43	12.2	7.0	57