[DynkanMaclaud]

Chile,

<textarea></textarea>
  <textarea id='target'></textarea>
  <button id='pasteButton'>Paste</button>
<script>
function copySelected(target) {
		if (target) {
    		const selectedText = document.getSelection().toString();
    		target.value = selectedText;
    }
};
pasteButton.addEventListener('click', () => copySelected(target));
</script>