A number of common practices used by website developers result in reduced website visibility, the most common of these are listed and described below:
Pages with HTML Frames are pages that are subdivided into separate, possibly scrollable areas. These have the advantage that a constant navigation area, or a constant page title area, can be displayed,. However search engine indexers can get confused while attempting to crawl a site having framed pages as they are unable to determine which frame contains the main content of the page.
It is now possible to build complete web sites using Macromedia Flash. To the human these pages can look very attractive, incorporating every aspect of a website including site navigation into an interactive Flash graphic. However web spiders cannot retrieve any useful information from the Flash code within the HTML pages, making these sites very unattractive to search engines.
Avoid excessive use of JavaScript. Large tracts of JavaScript embedded in a HTML page can confuse web spiders during their indexing procedure. If JavaScript must be used, always aim to export the code to an externally linked file, leaving only the JavaScript function calls embedded in the HTML page. Large websites quite often use a JavaScript powered drop down menu, mimicking a standard Windows menu, this is fine for providing human visitors with a familiar means of navigation, but the script is very unlikely to be parsed by a web spider. If a web site relies totally on a JavaScript menu for navigation it might be impossible for any web spider to crawl past the initial home page.
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