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


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


This value doesn’t affect the initial layout viewport, and the whole web page is viewable.
The viewport is scaled to fit the largest rectangle inscribed within the display.
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


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.


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
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Chrome ? Edge ? Firefox ? IE ? Opera ? Safari Full support 11WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS Full support 11Samsung Internet Android ?


Full support  
Full 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

Contributors to this page: mfuji09, chrisdavidmills, SteelCode94, Esteban-Rocha, ExE-Boss
Last updated by: mfuji09,