<Tr> <Td> <Ul> <Li> Software </Li> <Li> Unix </Li> <Li> Free software and open - source software </Li> </Ul> </Td> </Tr> <Ul> <Li> Software </Li> <Li> Unix </Li> <Li> Free software and open - source software </Li> </Ul> <Li> Free software and open - source software </Li> <Tr> <Th> Computer science </Th> </Tr>

When was the www introduced to the public