['copy','cut','paste','contextmenu','selectstart','dragstart','beforeinput','keydown'].forEach(type => {
  window.addEventListener(type, e => e.stopImmediatePropagation(), true);
});

document.querySelectorAll('*').forEach(el => {
  el.style.setProperty('user-select', 'text', 'important');
  el.style.setProperty('-webkit-user-select', 'text', 'important');

  el.oncopy = null;
  el.oncut = null;
  el.onpaste = null;
  el.oncontextmenu = null;
  el.onselectstart = null;
  el.onkeydown = null;
  el.onbeforeinput = null;
});