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Check the Browser compatibility table carefully before using this in production.

The viewport-fit CSS @viewport descriptor controls how a document's viewport fills the screen.

Syntax

/* Keyword values */
viewport-fit: auto;
viewport-fit: contain;
viewport-fit: cover;

Values

auto
This value doesn’t affect the initial layout viewport, and the whole web page is viewable.
contain
The viewport is scaled to fit the largest rectangle inscribed within the display.
cover
The viewport is scaled to fill the device display. It is highly recommended to make use of the safe area inset variables to ensure that important content doesn't end up outside the display.

Formal syntax

{{csssyntax}}

Accessibility concerns

When using the viewport-fit descriptor, one must keep in mind that not all device displays are rectangular, and should therefore make use of the safe area inset variables.

Specifications

Specification Status Comment
CSS Round Display Level 1
The definition of '"viewport-fit" descriptor' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
viewport-fit descriptor
Experimental
Chrome No support NoEdge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android ? Chrome Android ? Edge Mobile ? Firefox Android No support NoOpera Android ? Safari iOS No support NoSamsung Internet Android ?

Legend

No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also

Document Tags and Contributors

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