width

The width CSS descriptor is shorthand for setting both the min-width and the max-width descriptors 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.

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 definition

Related at-rule@viewport
Initial valueas each of the properties of the shorthand:
Percentagesas 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
Computed valueas 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

Formal syntax

<viewport-length>{1,2}

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

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

Examples

Setting minimum and maximum width

@viewport {
  width: 500px;
}

Specifications

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

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
width descriptorChrome No support 29 — 84Edge Full support 12
Prefixed
Full support 12
Prefixed
Prefixed Implemented with the vendor prefix: -ms-
Firefox No support NoIE Full support 10
Prefixed
Full support 10
Prefixed
Prefixed Implemented with the vendor prefix: -ms-
Opera Full support 16
Full support 16
No support 11.1 — 15
Safari No support NoWebView Android No support 4.4 — 37Chrome Android No support 29 — 84Firefox Android No support NoOpera Android Full support 16
Full support 16
No support 11.1 — 14
Safari iOS No support NoSamsung Internet Android Full support 2.0

Legend

Full support
Full support
No support
No support
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also