Accessibility of your site.

An accessible site is one that ensures delivery of its content successfully as often as possible. The functionality of pages, validity of HTML elements, uptime of the site's server and working status of site coding and components all come under site accessibility. If these features are ignored or faulty, both search engines and users will select other sites to visit.

The following list includes all the factors which affect the accessibility of your site:

• Broken Links : If an HTML link is broken, the contents of the linked-to page may never be found. In addition, some people give a opinion that search engines negatively degrade rankings on sites & pages with many broken links.
• Valid HTML & CSS : Although arguments exist about the necessity for full validation of HTML and CSS in accordance with W3C guidelines, it is generally agreed that code must meet minimum requirements of functionality and successful display so that your site may be spidered and cached properly by the search engines.
• Functionality of Forms and Applications : If select boxes, javascript or other input-required elements block content from being reached via direct hyperlinks, search engines may never find them. Keep the data that you want accessible to search engines on pages that can be directly accessed via a link. Similarlily, the successful functionality and implementation of any of these elements is critical to a site's accessibility for visitors. A non-functioning page, form or code element is unlikely to receive much attention from visitors.
• File Size : With the exception of a select few documents that search engine consider to be of exceptional importance, web pages greater than 150K in size are typically not fully cached. This is done to reduce index size, bandwidth and load on the servers, and is important to anyone building pages with exceptionally large amounts of content. So it is highly recommended that you keep the file size under 150K . Smaller file size also means faster download speed for users.
• Downtime & Server Speed : The performance of your site's server may have an adverse impact on search rankings and visitors if downtime and slow transfer speeds are common. Invest in high quality hosting to prevent this issue.