What is the largest Hong Kong ETF?

Could you please elaborate on the topic of "What is the largest Hong Kong ETF?" I'm curious to know which ETF in Hong Kong currently holds the title of being the largest in terms of assets under management or market capitalization. Additionally, I'm interested in understanding the factors that contribute to its size, such as its investment strategy, performance history, and the demand from investors. Could you also provide some insights into how this ETF compares to other major ETFs in the region? Finally, I'm wondering if there are any predictions or trends that suggest this ETF might continue to grow or face challenges in the future.