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TextUpdateEvent: updateRangeEnd property - Web APIs | MDN
TextUpdateEvent: updateRangeEnd property Limited availability
The TextUpdateEvent.updateRangeEnd
read-only property indicates the end position of the text range that is being replaced in the EditContext
object.
const editorEl = document.getElementById("editor");
const editContext = new EditContext();
editorEl.editContext = editContext;
editContext.addEventListener("textupdate", (e) => {
console.log(
`The user inserted the text "${e.text}" between index ${e.updateRangeStart} and index ${e.updateRangeEnd}.`,
);
});