Clipboard API supported?

{
  "hasClipboardEventInterface": true,
  "execCommandResults": {
    "copy": false,
    "cut": false,
    "paste": false
  },
  "ceiNotRequired": {
    "beforecopy": false,
    "copy": false,
    "beforecut": false,
    "cut": false,
    "beforepaste": false,
    "paste": false
  },
  "ceiRequired": {
    "beforecopy": true,
    "copy": true,
    "beforecut": true,
    "cut": true,
    "beforepaste": true,
    "paste": true
  }
}