This is a very interesting question. After a few years of web application, I will go back to my head to re-learn HTML, CSS, and JavaScript. Not that I didn't touch these things in previous years, in fact I have been rushing in the past few years. In the first line of writing code, it is not too small, but I found that if I want to continue writing the web, then I will learn the foundation of those foundations. Please don't tell me that things are simple, if it is simple In fact, it is the same, it is not difficult. In fact, after technology to a certain level, there will be a certain pause. I said before: Writing again. But now I am no longer thinking, because when I Try to imitate the implementation of complex controls on the Web on the Web, and find that the fact is not that. So I started to turn over DHTML, HTML, CSS and other documents from my beginning, and I found that I would only be a small part. If you really want to do it? These are very important. After all, there is no way to operate, it will not be accepted by the customer. I think I have to learn more, HTC, JavaScript OPP, CSS, XSL, XML or even html, I want to go later. I don't dare to say that I am familiar with these things. I only have to study. Look at others, the system's drilling official documentation, try to imitate the Windows interface, this is a relatively fast learning web way I want to say. I hope to spend the same in the dark Peers of themselves.