Alibaba Holdings Inc gave investors a closer look at the scale and growth of the Chinese e-commerce juggernaut in an IPO prospectus filed Tuesday in the first step of what could become the largest technology debut in history. Alibaba, which powers four-fifths of all online commerce conducted in the world’s second-largest economy, is expected to raise upward of $15 billion and potentially surpass the $16 billion that Facebook Inc managed in 2012.