1. Sorting out the basic concepts of html, basic knowledge to master
1 What is html (xhtml)
1) w3c organization and related standards, xhtml Verification method (whether it meets w3c requirements);
2) The basic structure of xhtml documents, basic specifications of xhtml1.0;
3) The idea of separation of content and performance, and the html structure should be as semantic as possible.
2 block-level tags
1)
2)