Taiwan's two bigger parties fear support for smaller Taiwan People's Party from younger voters could cost them the presidency

A man posing at a sculpture depicting Taiwan and mainland China on Pingtan Island, the closest point in China to the main island of Taiwan. Elections take place in Taiwan on Saturday. Photograph: Greg Baker/AFP via Getty Images Taiwan votes on Saturday in a closely-fought election that could have a major impact on the self-governing island's relationships with mainland China and the United States. Campaigning ended on Friday with big rallies in Taipei for the three candidates to succeed president Tsai Ing-wen, who has governed Taiwan for the past eight years. Vice-president Lai Ching-te has promised to continue Tsai's policy…