code: function insertClipboardContents(content, internal) {
          if (editor.queryCommandSupported('mceInsertClipboardContent')) {
            editor.execCommand('mceInsertClipboardContent', false, { content: content, internal: internal });
          } else {
            editor.execCommand('mceInsertContent', false, content);
          }
        }
docs: Inserts contents using the paste clipboard command if it's available if it isn't it will fallback
  to the core command.
  
  @private
  @param {String} content Content to insert at selection.
  @param {Boolean} internal State if the paste is to be considered internal or external.