What is the fine-grained topic of the following text: The UK's largest independent online fashion and beauty seller Asos Plc continues to go from strength to strength, with a 44% jump in full-year profit and a 35% surge in revenues confirming that it really does sit in one of retailing's rare sweet-spots with its focus fixed on fashion-savvy 16-34 year-olds. Only return the topic.
Asos Plc's financial performance and growth in the online fashion retail sector