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Many web designers do not pay attention in coding structure, the result is no one can find those websites in search engines!. In many cases search engine spiders cannot crawl 100% of those sites, this is because of huge size, html code error, navigation problem due to using scripts. By following these ten tips while designing and developing your website, you can improve your web presence.
1) Table structure: Nested tables can cause the huge page size and it could be problem with download times. Use separate tables wherever possible. Rather than using tables, use CSS to format your page layouts.
2) Page size: small web pages load faster. Make your page size to below 50K, so that search engine spiders can able to crawl your entire website without having any time delay.
3) Frames: Do not use Frames. Some search engines not even supported frames and it could be some display/alignment problem with some browsers. It could also affect while bookmarking a page. Remember, whatever you are trying to accomplish by using frames can usually be done with CSS.
4) Alt tags: Minimize the use of graphics and Flash. If your site having graphics try to explain those by adding ALT text. Since search engine spiders cannot read text within images, you should provide alternative text, so that spiders can understands what they mean.
5) Navigation: Each pages on your website should be easily connected. Use of JavaScript links and image maps may affect spidering your entire site or you should use text links at the bottom of your page to help search engine spiders to navigate each pages. Try to check your web pages in a text only browser and ensure you can easily navigate all the pages from page to page.
6) Title and Meta tags: Add title and Meta tags to each pages in your site and all title tags and Meta tags should be unique.
7) Sitemap: Provide a sitemap that linked from your homepage. It must be essential if your site having dynamic pages, that contains special characters such as ?,%,&,# etc. As these pages are generated automatically, search engines spiders cannot follow these links.
8) HTML codes: Internet explorer can display your page even if any minor errors in the html code, but it could be a major problem with search engine spiders. I recommend validating your html codes through some online tools that available in the net. By getting W3C standards can give your web pages greater visibility in web searches.
9) Cascading Style Sheets: CSS enables you to independently control the structure of your web page. By using CSS, you will get its benefits like smaller file sizes, browser compatibility and search engine friendly.
10) External CSS/JavaScript files: Call all your JavaScript and CSS from external file, so that spiders can easily access your data without causing any error.