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. | Obsolete | Initial definition. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 56 | ? | 31 | No | 43 | No |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 56 | 56 | ? | 31 | 43 | No | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/isComposing