HTML5 is the latest version of Hypertext Markup Language, the code that describes web pages. It's actually three kinds of code: HTML, which provides the structure; Cascading Style Sheets (CSS), which take care of presentation; and JavaScript, which makes things happen.
先引用 Gary Marshall的一段话,他说HTML5是HTML(Hypertext Markup Language)的新修订版本,如果把HTML当成一个APP的话,HTML5表示这个APP的第5个主版本。HTML5包含3个部分:HTML,CSS,JavaScript,从这句话的描述应该可以大概看出HTML5与HTML之前版本的不一样了。