<div id="paste" contenteditable="true"></div>
<script>
-window.getSelection().setPosition(document.getElementById("copy"));
+window.getSelection().collapse(document.getElementById("copy"));
document.execCommand("SelectAll");
document.execCommand("Copy");
-window.getSelection().setPosition(document.getElementById("paste"));
+window.getSelection().collapse(document.getElementById("paste"));
document.execCommand("Paste");
</script>