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As we all know, now the most popular site code structure is div, today to talk about CSS for search engine optimization help.
CSS can make your website to search engine more friendly, the website reasonable use CSS, can let search engine's spider to your website more readable, more easy index.
A very simple example of a picture on your site, although search engine spiders are very clever, but they still do not understand the text in the picture, when the search engine crawling your site will encounter obstacles, see this picture, do not know what, however, we can use CSS, this picture control as background display, This does not appear in the page code, but the user browsing the page can be displayed normally.
Another point, many of our pictures with text should be minimized, the picture background and text independent, the background with CSS control, and text directly written in the code, so that the appearance can be retained, and the search engine spider crawling is also very friendly. Obviously, direct text is better for SEO than adding alt on a picture, because search engines can't tell you that your alt text is completely related to your picture. As a result, text is more trusting to search engines than pictures and ALT attributes.
Here's a list of some common scenarios that don't take advantage of search optimizations for reference:
1. The website navigation uses the picture (solution: Uses the CSS to control the display background, uses the text connection. )
2. Use a large number of table layouts (Workaround: Website refactoring revision, recommended with Div layout, because the structure is clear, code streamlining. )
3. The Web page uses CSS and JavaScript code (workaround: Call the external CSS file and JS file in the header with a connection)
4. The site uses a lot of flash (solution: Minimize use, but some sites must be used, please use Google's SWFObject tool to add the appropriate text.) Sort of like Alt,swfobject's address: http://code.google.com/p/swfobject/)
Above personal opinion, hope to be helpful to everybody.
Wen/shallen depth SEO lab.