`inline-size` CSS property

The inline-size CSS property defines the size of an element’s block along the inline axis. If the writing-mode is horizontal, it corresponds to the width; if the writing mode is vertical, it corresponds to the height. A related property is block-size, which defines the other dimension of the element.

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

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

inline-size: auto;
writing-mode: horizontal-tb;

inline-size: auto;
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 inline-size.
  </div>
</section>

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

Syntax

/* <length> values */
inline-size: 300px;
inline-size: 25em;
inline-size: anchor-size(width);
inline-size: anchor-size(--my-anchor inline);

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

/* Keyword values */
inline-size: max-content;
inline-size: min-content;
inline-size: fit-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

Formal syntax

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

Browser compatibility

See also

• The mapped physical properties: width and height
• writing-mode