ToDo: shrink rows when \n+backspace
function (e) {
      if (e.keyCode === 13) {
        if (outline.targetOf(e).tagName !== 'TEXTAREA') { this.clearInputAndSave() } else { // <TEXTAREA>
          var preRows = parseInt(this.lastModified.getAttribute('rows'))
          this.lastModified.setAttribute('rows', (preRows + 1).toString())
          e.stopPropagation()
        }
      }
        // Remark by Kenny: If the user wants to input more lines into an one-line-only blank.
        //                 Direct him/her to a new blank (how?)
    }