This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The size read-only property of the MediaKeyStatusMap interface returns the number of key/value paIrs in the status map.


var size = MediaKeyStatusMap.size;


A long integer.


Specification Status Comment
Encrypted Media Extensions
The definition of 'size' in that specification.
Recommendation 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 Full support 42Edge Full support 13Firefox ? IE ? Opera Full support 29Safari ? WebView Android Full support 43Chrome Android Full support 42Edge Mobile Full support YesFirefox Android ? Opera Android Full support 29Safari iOS ? Samsung Internet Android Full support 4.0


Full support  
Full support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

Document Tags and Contributors

Contributors to this page: fscholz, david_ross, jpmedley
Last updated by: fscholz,