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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/isComposing below:

KeyboardEvent: isComposing property - Web APIs

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1. References
2. Web APIs
3. KeyboardEvent
4. isComposing

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• Value
• Examples
• Specifications
• Browser compatibility
• See also

1. UI Events
2. KeyboardEvent
3. Constructor
   1. KeyboardEvent()
4. Instance properties
   1. altKey
   2. charCode Deprecated
   3. code
   4. ctrlKey
   5. isComposing
   6. key
   7. keyCode Deprecated
   8. keyIdentifier Non-standard Deprecated
   9. location
   10. metaKey
   11. repeat
   12. shiftKey
5. Instance methods
   1. getModifierState()
   2. initKeyboardEvent() Deprecated
6. Inheritance
   1. UIEvent
   2. Event
7. Related pages for UI Events
   1. CompositionEvent
   2. FocusEvent
   3. InputEvent
   4. MouseEvent
   5. MouseScrollEvent Non-standard Deprecated
   6. MutationEvent Non-standard Deprecated
   7. TextEvent Deprecated
   8. UIEvent
   9. WheelEvent

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Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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The KeyboardEvent.isComposing read-only property returns a boolean value indicating if the event is fired within a composition session, i.e., after compositionstart and before compositionend.

A boolean.

js

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

• compositionstart and compositionend
• KeyboardEvent

.

This page was last modified on Apr 3, 2025 by MDN contributors.

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