This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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 the max-width or the max-height property depending on the value defined for 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. It relates to max-block-size, which defines the other dimension of the element.

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

/* <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: fill-available;

/* Global values */
max-inline-size: inherit;
max-inline-size: initial;
max-inline-size: unset;
Initial value 0
Applies to same as width and height
Inherited no
Percentages inline-size of containing block
Media visual
Computed value same as max-width and max-height
Animation type discrete
Canonical order the unique non-ambiguous order defined by the formal grammar



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

Formal syntax



HTML Content

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

CSS Content

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


Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes -webkit- No


38 — 511

No Yes -webkit- 10.1 -webkit-
Feature Android webview Chrome for Android Edge mobile Firefox for Android Opera Android iOS Safari Samsung Internet
Basic support 4.4 -webkit- 6.1 -webkit- No


38 — 511

? 10.2 -webkit- ?

1. From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

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