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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


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

Browser compatibility

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: mfluehr, mrenty, Sebastianz, cvrebert
 Last updated by: mfluehr,