Alibaba gave investors a closer look at the scale and growth of the Chinese e-commerce juggernaut in an initial public offering prospectus filed on Tuesday, the first step in what could be the largest technology debut in history. Alibaba Group Holding Ltd, which powers 80 percent of all online commerce conducted in the world’s second-largest economy, is expected to raise more than $15 billion, potentially surpassing the $16 billion that Facebook Inc raised when it went public in 2012. While the Alibaba brand name is hardly as well known among U.S.