files/en-us/web/api/uievent/sourcecapabilities/index.md
{{APIRef("Input Device Capabilities API")}}{{SeeCompatTable}}
The sourceCapabilities read-only property of the {{domxref("UIEvent")}} interface returns
an instance of the {{domxref('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.
An instance of {{domxref('InputDeviceCapabilities')}}.
{{Specifications}}
{{Compat}}