1. css bubbles do chat box
2. points clear position div such as the layout style:, absolute position is absolute, the parent div terms, relative, relative address, fixed, absolute address for the browser in terms of
3. There's div pulley fixed to the bottom of the div can not, under the final solution is to put out a div
4.panding and mar ---? Padding and margins
5.float left suspension excellent suspension, text-aliant distribution center is text
6.js can generate dom element, but the trouble, direct "," put elements in double quotes