Disable all the autocorrect and smart quotes for textareas on iOS

textarea_test.html

<textarea id="stupid" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>

<script>
  function checkInput(e) {
    if ((e.which == 39) || (e.which == 8216) || (e.which == 8217)) {
      e.preventDefault();
      document.execCommand('insertText', 0, "'");
    }
  }   
  var el = document.getElementById('stupid');
  el.addEventListener('keypress', checkInput, false);
</script>