W3cubDocs

/CSS

@viewport.max-width

The max-width CSS descriptor specifies the maximum width of the viewport of a document defined via the @viewport at-rule.

By default, the width is set as close as possible to the initial viewport considering the maximum width constraint.

Syntax

/* Keyword value */
max-width: auto;

/* <length> values */
max-width: 600px;
max-width: 80em;
max-width: 15cm;

/* <percentage> value */
max-width: 75%;

Values

auto: The used value is calculated from the other CSS descriptors' values.
<length>: A non-negative absolute or relative length.
<percentage>: A percentage value relative to the width of the initial viewport at zoom factor 1.0 for horizontal lengths. Must be non-negative.

Formal definition

Related at-rule	`@viewport`
Initial value	`auto`
Percentages	refer to the width of the initial viewport
Computed value	if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto`

Formal syntax

<viewport-length>where 
<viewport-length> = auto | <length-percentage>
where 
<length-percentage> = <length> | <percentage>

Examples

Setting viewport max width in pixels

@viewport {
  max-width: 600px;
}

Specifications

Specification	Status	Comment
CSS Device Adaptation The definition of '"max-width" descriptor' in that specification.	Working Draft	Initial definition

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
`max-width` descriptor	29 — 84	12 Prefixed 12 Prefixed Prefixed Implemented with the vendor prefix: -ms-	No	10 Prefixed 10 Prefixed Prefixed Implemented with the vendor prefix: -ms-	16 16 11.1 — 15	No

	Mobile
	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`max-width` descriptor	4.4 — 37	29 — 84	No	16 16 11.1 — 14	No	2.0