The Event interface represents any event which takes place in the DOM; some are user-generated (such as mouse or keyboard events), while others are generated by APIs (such as events that indicate an animation has finished running, a video has been paused, and so forth). There are many types of events, some of which use other interfaces based on the main Event interface. Event itself contains the properties and methods which are common to all events.

Interfaces based on Event

Below is a list of interfaces which are based on the main Event interface, with links to their respective documentation in the MDN API reference. Note that all event interfaces have names which end in "Event".

Constructor

Event()
Creates an Event object, returning it to the caller.

Properties

Event.bubbles Read only
A Boolean indicating whether the event bubbles up through the DOM or not.
Event.cancelBubble
A historical alias to Event.stopPropagation(). Setting its value to true before returning from an event handler prevents propagation of the event.
Event.cancelable Read only
A Boolean indicating whether the event is cancelable.
Event.composed Read only
A Boolean value indicating whether or not the event can bubble across the boundary between the shadow DOM and the regular DOM.
Event.currentTarget Read only
A reference to the currently registered target for the event. This is the object to which the event is currently slated to be sent; it's possible this has been changed along the way through retargeting.
Event.deepPath 
An Array of DOM Nodes through which the event has bubbled.
Event.defaultPrevented Read only
Indicates whether or not event.preventDefault() has been called on the event.
Event.eventPhase Read only
Indicates which phase of the event flow is being processed.
Event.explicitOriginalTarget Read only
The explicit original target of the event (Mozilla-specific).
Event.originalTarget Read only
The original target of the event, before any retargetings (Mozilla-specific).
Event.returnValue
A historical property introduced by Internet Explorer and eventually adopted into the DOM specification in order to ensure existing sites continue to work. Ideally, you should try to use Event.preventDefault() and Event.defaultPrevented instead, but you can use returnValue if you choose to do so.
Event.srcElement
A non-standard alias (from old versions of Microsoft Internet Explorer) for Event.target, which is starting to be supported in some other browsers for web compatibility purposes.
Event.target Read only
A reference to the target to which the event was originally dispatched.
Event.timeStamp Read only
The time at which the event was created (in milliseconds). By specification, this value is time since epoch, but in reality browsers' definitions vary; in addition, work is underway to change this to be a DOMHighResTimeStamp instead.
Event.type Read only
The name of the event (case-insensitive).
Event.isTrusted Read only
Indicates whether or not the event was initiated by the browser (after a user click for instance) or by a script (using an event creation method, like event.initEvent).

Obsolete properties

Event.scoped Read only
A Boolean indicating whether the given event will bubble across through the shadow root into the standard DOM. This property has been renamed to composed.

Methods

Event.createEvent() 

Creates a new event, which must then be initialized by calling its initEvent() method.

Event.composedPath()
Returns the event’s path (objects on which listeners will be invoked). This does not include nodes in shadow trees if the shadow root was created with its ShadowRoot.mode closed.
Event.initEvent()
Initializes the value of an Event created. If the event has already being dispatched, this method does nothing.
Event.preventDefault()
Cancels the event (if it is cancelable).
Event.stopImmediatePropagation()
For this particular event, no other listener will be called. Neither those attached on the same element, nor those attached on elements which will be traversed later (in capture phase, for instance)
Event.stopPropagation()
Stops the propagation of events further along in the DOM.

Obsolete methods

Event.getPreventDefault()
Non-standard. Returns the value of Event.defaultPrevented. Use Event.defaultPrevented instead.
Event.preventBubble() Obsolete since Gecko 24
Prevents the event from bubbling. Obsolete, use event.stopPropagation instead.
Event.preventCapture() Obsolete since Gecko 24
Obsolete, use event.stopPropagation instead.

Specifications

Specification Status Comment
DOM
The definition of 'Event' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes Yes Yes Yes
Event() constructor15 Yes11 No11.66
bubbles Yes ? ? ? Yes ?
cancelBubble Yes1 Yes532 Yes Yes1 Yes
cancelable Yes ? ? ? Yes ?
composed53 ?52 ?40 ?
composedPath

53

50 — 533

No52 No

40

37 — 403

10
createEvent No ? ? ? No ?
currentTarget Yes Yes Yes

9

6 — 94

Yes10
defaultPrevented18 Yes69115
eventPhase45 ? ? ?32 ?
explicitOriginalTarget No No Yes No No No
getPreventDefault No ? Yes — 595 ? No ?
initEvent Yes Yes

17

Yes — 176

Yes Yes Yes
isTrusted467 Yes Yes No8337 No
originalTarget No No Yes No No No
preventBubble No ? Yes — 24 ? No ?
preventCapture No ? Yes — 24 ? No ?
preventDefault Yes Yes Yes9 Yes Yes
returnValue Yes Yes636 Yes Yes
srcElement Yes Yes62 Yes Yes Yes
stopImmediatePropagation6 Yes109155
stopPropagation Yes Yes Yes9 Yes Yes
target Yes Yes Yes Yes Yes Yes
timeStamp499 Yes Yes9 Yes9369 Yes
type45 ? ? ?32 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?
Event() constructor1518 Yes1411.66 ?
bubbles Yes Yes ? ? Yes ? ?
cancelBubble Yes1 Yes1 Yes532 Yes1 Yes ?
cancelable Yes Yes ? ? Yes ? ?
composed5353 ?5240 ? ?
composedPath

53

50 — 533

53

50 — 533

No52

40

37 — 403

10 ?
createEvent No No ? ? No ? ?
currentTarget Yes Yes Yes Yes Yes10 ?
defaultPrevented1818 Yes6115 ?
eventPhase4545 ? ?32 ? ?
explicitOriginalTarget No No No Yes No No ?
getPreventDefault No No ? Yes — 595 No ? ?
initEvent Yes Yes Yes

17

Yes — 176

Yes Yes ?
isTrusted467467 Yes Yes337 No ?
originalTarget No No No Yes No No ?
preventBubble No No ? Yes — 24 No ? ?
preventCapture No No ? Yes — 24 No ? ?
preventDefault Yes Yes Yes Yes Yes Yes ?
returnValue Yes Yes Yes63 Yes Yes ?
srcElement Yes Yes Yes62 Yes Yes ?
stopImmediatePropagation618 Yes10155 ?
stopPropagation Yes Yes Yes Yes Yes Yes ?
target Yes Yes Yes Yes Yes Yes ?
timeStamp499499 Yes Yes9369 Yes ?
type4545 ? ?32 ? ?

1. Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.

2. Prior to Firefox 53, this property was defined on the UIEvent interface. See bug 1298970 for more details.

3. Supported as deepPath.

4. On Internet Explorer 6 through 8, the event model is different. Event listeners are attached with the non-standard EventTarget.attachEvent method. In this model, there is no equivalent to event.currentTarget and this is the global object. One solution to emulate the event.currentTarget feature is to wrap your handler in a function calling the handler using Function.prototype.call with the element as a first argument. This way, this will be the expected value.

5. See bug 691151.

6. Before Firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.

7. Starting with Chrome 53 and Opera 40, untrusted events do not invoke the default action.

8. In Internet Explorer, all events are trusted except those that are created with the createEvent() method.

9. Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.

See also