Preferably, {HEAD ~ the rendering} is by {TAIL ~ a browser} distributed amongst a set of devices, and the content comprises data to be physically rendered 
is by
Preferably , { HEAD ~ the rendering } is by { TAIL ~ a browser } distributed amongst a set of devices , and the content comprises data to be physically rendered
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH