Recently, I was working on the thesis proposal report every day, and I was itching to design the Web again. I suddenly encountered a problem. When I designed the WEB page, I always ran it in IE. I had never considered Firefox, let alone Chrome, but now it is different. Well, at least I think WEB pages that are not compatible with Firefox are extremely ugly and fake, so ever since I had this concept, I started to pay attention to this compatibility when designing pages, and this time I encountered a compatibility problem, in HTML There is a floating frame,