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@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.

Related at-rule @viewport
Initial value auto
Percentages refer to the width of the initial viewport
Media as each of the properties of the shorthand:
Computed value if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto
Canonical order the unique non-ambiguous order defined by the formal grammar

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 syntax

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

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
Basic support 29 ? No 10
Prefixed
10
Prefixed
Prefixed Requires the vendor prefix: -ms-
 16
16
11.1 — 15
No
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support 4.4 29 ? No 16
16
11.1 — 14
No Yes

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https://developer.mozilla.org/en-US/docs/Web/CSS/@viewport/max-width