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inline-size

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

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

Try it

Syntax

/* <length> values */
inline-size: 300px;
inline-size: 25em;

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

/* Keyword values */
inline-size: max-content;
inline-size: min-content;
inline-size: fit-content(20em);
inline-size: auto;

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

Values

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

Formal definition

Initial value	`auto`
Applies to	same as `width` and `height`
Inherited	no
Percentages	inline-size of containing block
Computed value	same as `width` and `height`
Animation type	a length, percentage or calc();

Formal syntax

inline-size = 
  <'width'>

Examples

Setting inline size in pixels

HTML

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

CSS

.exampleText {
  writing-mode: vertical-rl;
  background-color: yellow;
  inline-size: 110px;
}

Result

Specifications

Specification
CSS Logical Properties and Values Level 1 # dimension-properties

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`inline-size`	57	79	41	No	44	12.1	57	57	41	43	12.2	5.0
`fit-content`	57	79	41	No	44	12.1	57	57	41	43	12.2	5.0
`fit-content_function`	No	No	91	No	No	No	No	No	No	No	No	No
`max-content`	57	79	66 41	No	44	12.1	57	57	66 41	43	12.2	5.0
`min-content`	57	79	66 41	No	44	12.1	57	57	66 41	43	12.2	5.0