`max-inline-size` CSS property

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

max-inline-size: 150px;
writing-mode: horizontal-tb;

max-inline-size: 150px;
writing-mode: vertical-rl;

max-inline-size: 20px;
writing-mode: horizontal-tb;

max-inline-size: 75%;
writing-mode: vertical-lr;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box where you can change the max-inline-size.
  </div>
</section>

#example-element {
  display: flex;
  flex-direction: column;
  background-color: #5b6dcd;
  height: 80%;
  justify-content: center;
  color: white;
}

Syntax

/* <length> values */
max-inline-size: 300px;
max-inline-size: 25em;
max-inline-size: anchor-size(width);
max-inline-size: anchor-size(--my-anchor 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	$1$, <a href="/en-US/docs/Web/CSS/Reference/Values/percentage#interpolation" title="Values of the <percentage> CSS data type are interpolated as real, floating-point numbers.">percentage</a> or calc();

Formal syntax

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

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 Module Level 1 # propdef-max-inline-size
CSS Box Sizing Module Level 3 # 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	WebView on iOS
`max-inline-size`	57	79	41	44	12.1 10.1	57	41	43	12.2 10.3	7.0	57	12.2 10.3
`anchor-size`	125	125	147	111	26	125	147	83	26	27.0	125	26
`fit-content`	57	79	94 41	44	12.1	57	94 41	43	12.2	7.0	57	12.2
`fit-content_function`	No	No	91	No	No	No	No	No	No	No	No	No
`max-content`	57	79	66 41	44	12.1	57	66 41	43	12.2	7.0	57	12.2
`min-content`	57	79	66 41	44	12.1	57	66 41	43	12.2	7.0	57	12.2
`none`	57	79	41	44	12.1	57	41	43	12.2	7.0	57	12.2
`stretch`	138	138	No	122	27	138	No	91	27	30.0	138	27