The Event interface represents an 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). While events are usually triggered by such "external" sources, they can also be triggered programmatically, such as by calling the HTMLElement.click() method of an element, or by defining the event, then sending it to a specified target using EventTarget.dispatchEvent(). 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.

Many DOM elements can be set up to accept (or "listen" for) these events, and execute code in response to process (or "handle") them. Event-handlers are usually connected (or "attached") to various HTML elements (such as <button>, <div>, <span>, etc.) using EventTarget.addEventListener(), and this generally replaces using the old HTML event handler attributes. Further, when properly added, such handlers can also be disconnected if needed using removeEventListener(). Note that one element can have several such handlers, even for the exact same event, particularly if separate, independent code modules attach them, each for its own independent purposes (for example, a webpage with an advertising-module and statistics-module both monitoring video-watching). When there are many nested elements, each with its own handler(s), event processing can become very complicated -- especially where a parent element receives the very same event as its child elements because "spatially" they overlap so the event technically occurs in both, and the processing order of such events depends on the Event bubbling and capture settings of each handler triggered.

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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
Event() constructorChrome Full support 15Edge Full support YesFirefox Full support 11IE No support NoOpera Full support 11.6Safari Full support 6WebView Android Full support YesChrome Android Full support 18Edge Mobile Full support YesFirefox Android Full support 14Opera Android Full support 11.6Safari iOS Full support 6Samsung Internet Android ?
bubblesChrome Full support YesEdge ? Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android ? Opera Android Full support YesSafari iOS ? Samsung Internet Android ?
cancelBubbleChrome Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.
Edge Full support YesFirefox Full support 53
Notes
Full support 53
Notes
Notes Prior to Firefox 53, this property was defined on the UIEvent interface. See bug 1298970 for more details.
IE Full support YesOpera Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.
Safari Full support YesWebView Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.
Chrome Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.
Edge Mobile Full support YesFirefox Android Full support 53
Notes
Full support 53
Notes
Notes Prior to Firefox 53, this property was defined on the UIEvent interface. See bug 1298970 for more details.
Opera Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 58 and Opera 45, setting this property to false does nothing, as per spec discussion.
Safari iOS Full support YesSamsung Internet Android ?
cancelableChrome Full support YesEdge ? Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android ? Opera Android Full support YesSafari iOS ? Samsung Internet Android ?
composedChrome Full support 53Edge ? Firefox Full support 52IE ? Opera Full support 40Safari ? WebView Android Full support 53Chrome Android Full support 53Edge Mobile ? Firefox Android Full support 52Opera Android Full support 40Safari iOS ? Samsung Internet Android ?
composedPathChrome Full support 53
Full support 53
No support 50 — 53
Alternate Name
Alternate Name Uses the non-standard name: deepPath
Edge No support NoFirefox Full support 52IE No support NoOpera Full support 40
Full support 40
No support 37 — 40
Alternate Name
Alternate Name Uses the non-standard name: deepPath
Safari Full support 10WebView Android Full support 53
Full support 53
No support 50 — 53
Alternate Name
Alternate Name Uses the non-standard name: deepPath
Chrome Android Full support 53
Full support 53
No support 50 — 53
Alternate Name
Alternate Name Uses the non-standard name: deepPath
Edge Mobile No support NoFirefox Android Full support 52Opera Android Full support 40
Full support 40
No support 37 — 40
Alternate Name
Alternate Name Uses the non-standard name: deepPath
Safari iOS Full support 10Samsung Internet Android ?
createEventChrome No support NoEdge ? Firefox ? IE ? Opera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android ? Opera Android No support NoSafari iOS ? Samsung Internet Android ?
currentTargetChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support 9
Full support 9
No support 6 — 9
Notes
Notes 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.
Opera Full support YesSafari Full support 10WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support 10Samsung Internet Android ?
defaultPreventedChrome Full support 18Edge Full support YesFirefox Full support 6IE Full support 9Opera Full support 11Safari Full support 5WebView Android Full support YesChrome Android Full support 18Edge Mobile Full support YesFirefox Android Full support 6Opera Android Full support 11Safari iOS Full support 5Samsung Internet Android ?
eventPhaseChrome Full support 45Edge ? Firefox ? IE ? Opera Full support 32Safari ? WebView Android Full support 45Chrome Android Full support 45Edge Mobile ? Firefox Android ? Opera Android Full support 32Safari iOS ? Samsung Internet Android ?
explicitOriginalTarget
Non-standard
Chrome No support NoEdge No support NoFirefox Full support YesIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile No support NoFirefox Android Full support YesOpera Android No support NoSafari iOS No support NoSamsung Internet Android ?
getPreventDefault
DeprecatedNon-standard
Chrome No support NoEdge ? Firefox No support ? — 59
Notes
No support ? — 59
Notes
Notes See bug 691151.
IE ? Opera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android No support ? — 59
Notes
No support ? — 59
Notes
Notes See bug 691151.
Opera Android No support NoSafari iOS ? Samsung Internet Android ?
initEvent
Deprecated
Chrome Full support YesEdge Full support YesFirefox Full support 17
Full support 17
No support ? — 17
Notes
Notes Before Firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.
IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 17
Full support 17
No support ? — 17
Notes
Notes Before Firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.
Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
isTrustedChrome Full support 46
Notes
Full support 46
Notes
Notes Starting with Chrome 53 and Opera 40, untrusted events do not invoke the default action.
Edge Full support YesFirefox Full support YesIE No support No
Notes
No support No
Notes
Notes In Internet Explorer, all events are trusted except those that are created with the createEvent() method.
Opera Full support 33
Notes
Full support 33
Notes
Notes Starting with Chrome 53 and Opera 40, untrusted events do not invoke the default action.
Safari No support NoWebView Android Full support 46
Notes
Full support 46
Notes
Notes Starting with version 53, untrusted events do not invoke the default action.
Chrome Android Full support 46
Notes
Full support 46
Notes
Notes Starting with Chrome 53 and Opera 40, untrusted events do not invoke the default action.
Edge Mobile Full support YesFirefox Android Full support YesOpera Android Full support 33
Notes
Full support 33
Notes
Notes Starting with Chrome 53 and Opera 40, untrusted events do not invoke the default action.
Safari iOS No support NoSamsung Internet Android ?
originalTarget
Non-standard
Chrome No support NoEdge No support NoFirefox Full support YesIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile No support NoFirefox Android Full support YesOpera Android No support NoSafari iOS No support NoSamsung Internet Android ?
preventBubble
DeprecatedNon-standard
Chrome No support NoEdge ? Firefox No support ? — 24IE ? Opera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android No support ? — 24Opera Android No support NoSafari iOS ? Samsung Internet Android ?
preventCapture
DeprecatedNon-standard
Chrome No support NoEdge ? Firefox No support ? — 24IE ? Opera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android No support ? — 24Opera Android No support NoSafari iOS ? Samsung Internet Android ?
preventDefaultChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support 9Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
returnValue
Deprecated
Chrome Full support YesEdge Full support YesFirefox Full support 63IE Full support 6Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 63Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
srcElement
Non-standard
Chrome Full support YesEdge Full support YesFirefox Full support 62IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 62Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
stopImmediatePropagationChrome Full support 6Edge Full support YesFirefox Full support 10IE Full support 9Opera Full support 15Safari Full support 5WebView Android Full support YesChrome Android Full support 18Edge Mobile Full support YesFirefox Android Full support 10Opera Android Full support 15Safari iOS Full support 5Samsung Internet Android ?
stopPropagationChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support 9Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
targetChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
timeStampChrome Full support 49
Notes
Full support 49
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Edge Full support YesFirefox Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
IE Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Opera Full support 36
Notes
Full support 36
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Safari Full support YesWebView Android Full support 49
Notes
Full support 49
Notes
Notes Starting with version 49, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Chrome Android Full support 49
Notes
Full support 49
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Edge Mobile Full support YesFirefox Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Opera Android Full support 36
Notes
Full support 36
Notes
Notes Starting with Chrome 49, Firefox 54 and Opera 36, this property returns DOMHighResTimeStamp instead of DOMTimeStamp.
Safari iOS Full support YesSamsung Internet Android ?
typeChrome Full support 45Edge ? Firefox ? IE ? Opera Full support 32Safari ? WebView Android Full support 45Chrome Android Full support 45Edge Mobile ? Firefox Android ? Opera Android Full support 32Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.
Uses a non-standard name.
Uses a non-standard name.

See also