isTrusted property
The isTrusted read-only property of the
Event interface is a boolean value that is true
when the event was generated by the user agent (including via user actions
and programmatic methods such as HTMLElement.focus),
and false when the event was dispatched via
EventTarget.dispatchEvent.
The only exception is the click event, which initializes the isTrusted
property to false in user agents.
Implementation
external bool get isTrusted;