As a front-end engineer, you should be professional.
web
world wide web, also called (World Wide Web, www, web), is a website that can be accessed in a browser based on the http protocol.
w3c: is an organization that creates and maintains web standards.
html
hypertext markup language, hypertext markup language, a descriptive markup language used to describe the structure and semantics of documents. It is the structural standard of w3c.
xhtml
Extensible html, pure, standard html; (XHTML1.0 and HTML4.0 mark are basically the same)
html5
A hypertext markup language first named by WHATWG (Web Hypertext Application Technology Working Group), and then combined with W3C's xhtml2.0 (standard) to produce the latest generation of hypertext markup language. It can be simply understood as: HTML 5 ≈ HTML+CSS 3+JS+API
The difference between html5 and html:
- The html5 document statement is abbreviated "! doctype html",
- New global structure attributes
- Api ，
- new element
- Cancel old elements
javascript
javascript developed the ECMAScript standard and developed based on the ECMAScript standard. The browser is just a host environment for ECMAScript. JavaScript is an independent language, not limited to web browsers. (Currently, there are mainly web front-end scripting languages based on browsers and scripting languages based on V8 engine)
Web App
Systems and applications based on web development. Web pages and websites are web apps. It can be divided into mobile web app and pc web app;