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@viewport.width

The width CSS descriptor is shorthand for setting both the min-width and the max-width of the viewport. By providing one viewport length value, that value will determine both the min-width and the max-width to the value provided.

If two viewport values are provided the first value will be set to the min-width and the second value will be set max-width.

Related at-rule @viewport
Initial value as each of the properties of the shorthand:
Percentages as each of the properties of the shorthand:
  • min-width: refer to the width of the containing block
  • max-width: refer to the width of the containing block
Media as each of the properties of the shorthand:
Computed value as each of the properties of the shorthand:
  • min-width: the percentage as specified or the absolute length
  • max-width: the percentage as specified or the absolute length or none
Canonical order order of appearance in the formal grammar of the values

Syntax

/* An example with one viewport value: */
@viewport {
    width: 320px;
}

/* An example with two viewport values: */
@viewport {
    width: 320px, 120px;
}

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 or height of the initial viewport at zoom factor 1.0, for horizontal and vertical lengths respectively. Must be non-negative.

Formal syntax

auto | <length> | <percentage>

Specifications

Specification Status Comment
CSS Device Adaptation
The definition of '"min-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/width