Taiwanese voted on Saturday for their next president and parliament, an election being closely monitored by China and the United States as they look for stability in the region at a time of political transition for both superpowers.Opinion polls suggest the presidential race will be tight. But a slight advantage is seen for incumbent Nationalist Ma Ying-jeou, 61, who has fostered warmer ties with China, over Tsai Ing-wen of the opposition Democratic Progressive Party (DPP).Voters queued up in orderly lines in Taipei and other cities island-wide after polls opened at 8:00 a.m. (0000 GMT).