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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.

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

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/@viewport/max-width