get input text

input.user.js

// ==UserScript==
// @name        Visual Textarea
// @namespace   textarea
// @include     http://*
// @include     https://*
// @grant       none
// @version     1.0
// @author      -
// @description 2022/11/23 14:19:51
// ==/UserScript==


const onInput = (event) => {
  const target = event.target;
  if(target.contentEditable === "true"){
    console.log(target.textContent);
  } else {
    console.log(target.value);
  }
};

const weakSet = new WeakSet();
const onUpdate = (element) => {
  if(weakSet.has(element)){
    return;
  }
  element.addEventListener("input", onInput, {
    passive: false
  });
  weakSet.add(element);
};

const onFocusin = (event) => {
  const element = event.target;
  if(element){
   onUpdate(element);
  }
};
const onFocusout = (event) => {
  const element = event.target;
  if(element){
    element.removeEventListener("input", onInput);
    weakSet.delete(element);
  }
};
document.addEventListener("focusin", onFocusin, {
    passive: false
});
document.addEventListener("focusout", onFocusout, {
    passive: false
});