The min-zoom CSS descriptor sets the minimum zoom factor of a document defined by the @viewport at-rule. The browser will not zoom out any further than this, whether automatically or at the user's request.

A zoom factor of 1.0 or 100% corresponds to no zooming. Larger values are zoomed in. Smaller values are zoomed out.

Related at-rule@viewport
Initial valueauto
Percentagesthe zoom factor itself
Mediaas each of the properties of the shorthand:
Computed valueauto, or a non-negative number or percentage as specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* Keyword value */
min-zoom: auto;

/* <number> values */
min-zoom: 0.8;
min-zoom: 2.0;

/* <percentage> value */
min-zoom: 150%;


The user agent will set the document's lower zoom factor limit.
A non-negative number limiting the minimum value of the zoom factor.
A non-negative percentage limiting the minimum value of the zoom factor.

Formal syntax

auto | <number> | <percentage>


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support29 Yes -ms- No10 -ms- ? No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ?29 Yes -ms- No ? No ?

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Last updated by: connorshea,