The browser works:
https://blog.csdn.net/Luncles/article/details/80320082
2.HTML, the relationship between XML, JSON:
https://blog.csdn.net/qq_36346262/article/details/79335397
3.CSS, HTML, JavaScript side by side:
HTML + CSS: static pages
Some features dynamic, interactive: Javascript
4.jQuery is a library of JavaScript, HTML can be operated
5. Developer Tools good Google browser (do not forget to network)