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The user-zoom CSS descriptor controls whether or not the user can change the zoom factor of a document defined by @viewport.

/* Keyword values */
user-zoom: zoom;
user-zoom: fixed;

Related at-rule@viewport
Initial valuezoom
Percentagesrefer to the size of bounding box
Mediavisual, continuous
Computed valueas specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar



The user can zoom in or out.
The user cannot zoom in or out.

Formal syntax

zoom | fixed


Accessibility concerns

Disabling zooming capabilities prevents people experiencing low vision conditions from being able to read and understand page content.


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

Browser compatibility

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Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? ? ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? ?


Document Tags and Contributors

Contributors to this page: chrisdavidmills, ericwbailey, mfluehr, mrenty, Sebastianz, cvrebert
Last updated by: chrisdavidmills,