Input events fire multiple times for single keystroke

Phenomenon

In Edge on Windows, the input event may fire multiple times for a single keystroke, causing event handlers to execute more than expected. This can lead to performance issues and incorrect behavior.

Reproduction example

1. Create a contenteditable div.
2. Add an event listener for the input event that logs each event.
3. Type a single character.
4. Observe how many times the input event fires.

Observed behavior

• In Edge on Windows, the input event may fire 2-3 times for a single keystroke.
• Event handlers are executed multiple times unnecessarily.
• This can cause performance degradation and incorrect application behavior.

Expected behavior

• The input event should fire exactly once per user input action.
• Event duplication should not occur.
• The event should accurately represent the actual input change.