Version of the heart and layout process
Version of the heart: is the main content area of the page where the species, the general level is centered in the browser window, the common width is 960px, 980px, 1000px, 1200px and so on.
Layout process:
1) determine the core part of the page;
2) Analysis of page module rows, each row and column module module;
3) Preparation of html structure;
4) CSS initialization, and then begin to apply the principles of the box model, each module is controlled by DIV + CSS page layout.