1. inputdevicecapabilities api: firestouchevents

  2. touchevent api

  3. touchevent api: altkey

  4. touchevent api: changedtouches

  5. touchevent api: ctrlkey

  6. touchevent api: metakey

  7. touchevent api: shiftkey

  8. touchevent api: targettouches

  9. touchevent api: touches

  10. touchevent api: `touchevent()` constructor