This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

The FocusEvent() constructor returns a newly created FocusEvent object with an optional EventTarget. When a change a focus has a source and a destination, the relatedTarget value must be set to the other target.


var focusEvent = new FocusEvent(typeArg, focusEventInit); 


The FocusEvent() constructor also inherits arguments from UIEvent() and from Event().

Is a DOMString representing the name of the event.
Is a FocusEventInit dictionary, having the following fields:
  • "relatedTarget", optional and defaulting to null, is an EventTarget representing the secondary target of a FocusEvent.

The FocusEventInit dictionary also accepts fields from the UIEventInit and EventInit dictionaries.


Specification Status Comment
Document Object Model (DOM) Level 3 Events Specification
The definition of 'FocusEvent()' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 24.0 (24.0) Not supported (Yes) (Yes)
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) 24.0 (24.0) Not supported (Yes) (Yes)

See also


Document Tags and Contributors

 Contributors to this page: teoli, kscarfone
 Last updated by: teoli,