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

EditContext: compositionstart event - Web APIs

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The compositionstart event of the EditContext interface fires when composition using a Input Method Editor (IME) window starts.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("compositionstart", (event) => { })

oncompositionstart = (event) => { }

In the following example, the editable region's border is set to red when the compositionstart event fires, and back to black when the compositionend event fires. Note that the event listener callbacks in this example are only called when using an IME window, or other platform-specific editing UI surfaces, to compose text.

#text-editor {
  border: 1px solid black;
}
#text-editor.is-composing {
  border-color: red;
}

<div id="text-editor"></div>

const editorElement = document.getElementById("text-editor");
const editContext = new EditContext();
editorElement.editContext = editContext;

editContext.addEventListener("compositionstart", (event) => {
  editorElement.classList.add("is-composing");
});

editContext.addEventListener("compositionend", (event) => {
  editorElement.classList.remove("is-composing");
});

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