This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The initCompositionEvent() method of the CompositionEvent interface initializes the attributes of a CompositionEvent object instance.


 compositionEventInstance.initCompositionEvent(typeArg, canBubbleArg, cancelableArg, viewArg, dataArg, localeArg)


A DOMString representing the type of composition event; this will be one of compositionstart, compositionupdate, or compositionend.
A Boolean specifying whether or not the event can bubble.
A Boolean shether or not the event can be canceled.
The Window object from which the event was generated.
A DOMString representing the value of the data attribute.
A DOMString representing the value of the locale attribute.

Return value



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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Chrome Full support YesEdge Full support YesFirefox Full support 9IE Full support YesOpera No support NoSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 9Opera Android ? Safari iOS ? Samsung Internet Android ?


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 also

Document Tags and Contributors

Contributors to this page: wbamberg, karlstolley, chrisdavidmills
Last updated by: wbamberg,