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

The UIEvent.sourceCapabilities read-only property returns an instance of the InputDeviceCapabilities interface which provides information about the physical device responsible for generating a touch event. If no input device was responsible for the event, it returns null.

When a single user interaction with an input device generates a series of different input events, the sourceCapabilities property for all of them will point to the same instance of InputDeviceCapabilities. For example, when a user lifts their finger off of a touchscreen, several UIEvents may be generated including touchend, mousedown, click, and focus. All of these events must have the same sourceCapabilities representing the touchscreen.

A device is considered "responsible" for an event only when that interaction is part of the abstraction provided by the web platform. For example, many user agents allow a window to be resized with a mouse or a keyboard, but this detail is not exposed to the web platform in any way, and so the sourceCapabilities of a resize event will typically be null.


var iDC = event.sourceCapabilities


An instance of InputDeviceCapabilities.


Specification Status Comment
The definition of 'sourceCapabilities' in that specification.
Draft Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 47Edge Full support ≤79Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support 47Chrome Android Full support 47Firefox Android ? Opera Android Full support YesSafari iOS ? Samsung Internet Android Full support 5.0


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