How do I copy to the clipboard in JavaScript?

_x000D_ _x000D_ What is the best way to copy text to the clipboard? (multi-browser) I have tried: function copyToClipboard(text) { if (window.clipboardData) { // Internet Explorer window.clipboardData.setData("Text", text); } else { unsafeWindow.netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); const clipboardHelper = Components.classes["@mozilla.org/widget/clipboardhelper;1"].getService(Components.interfaces.nsIClipboardHelper); clipboardHelper.copyString(text); } } but in Internet Explorer it gives a syntax error. In Firefox, it says unsafeWindow is not defined. A nice trick without flash: How does Trello access the user's clipboard?