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                <div>тест строка для <b>копирования</b> с <span style="color: red;">html</span> разметкой</div>

<noscript><input class="field" value="поле без поддержки js" /></noscript>

<div editor class="field no-js" contenteditable>поле с поддержкой js</div>

<div class="field" contenteditable>поле с поведением по умолчанию</div>



                .no-js { display: none; }

.field {
  width: 300px;
  margin: 10px 0;
  padding: 0 3px;
  font: normal normal 16px / 20px serif;
  border: 1px solid gray;


                let field = document.body.querySelector('[editor]');
field.addEventListener('paste', (e) => {
  // Получаем текстовые данные из буфера обмена
  let paste = (e.clipboardData || window.clipboardData).getData('text');
  // Вставляем текст через "execCommand", чтобы не мучиться с выделением и отменой редактирования ctrl-z
  document.execCommand("insertText", false, paste);
  // Отменяем поведение по умолчанию