Pending specifications are {HEAD ~ specifications} that will not execute until some condition or {TAIL ~ conditions} are satisfied on the client 
not execute until
Pending specifications are { HEAD ~ specifications } that will not execute until some condition or { TAIL ~ conditions } are satisfied on the client
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH