MDN’s new design is in Beta! A sneak peek:


The KeyboardEvent.isComposing read-only property returns a Boolean value indicating if the event is fired after compositionstart and before compositionend.


var bool = event.isComposing;


var kbdEvent = new KeyboardEvent("syntheticKey", false);
console.log(kbdEvent.isComposing); // return false


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 56.0 31.0 (31.0) No support 43 No support
Feature Android Webview Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support 56.0 31.0 (31.0) No support 43 No support 56.0

See also

Document Tags and Contributors

 Contributors to this page: jpmedley, Zcorpan, poiru, fscholz, teoli
 Last updated by: jpmedley,