Summary The user-zoom CSS descriptor controls whether or not the user should be able to change the zoom factor of a document defined by @viewport. Related at-rule@viewportInitial valuezoomPercentagesrefer to the size of bounding boxMediavisual, continuousComputed valueas specifiedCanonical orderthe unique non-ambiguous order defined by the formal grammar Syntax /* Keyword values */ user-zoom: zoom; user-zoom: fixed; Values zoom The user can zoom in or out. fixed The user cannot zoom in or out. Formal syntax zoom | fixed Specifications Specification Status Comment CSS Device AdaptationThe definition of '"user-zoom" descriptor' in that specification. Working Draft Initial definition Browser compatibility Desktop Mobile 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 ? ? ? ? ? ?