WSYWIG or CMS ProgramsThe worst Technology Blockers of all Most programs that allow you to design a site with little or no knowledge of writing HTML, like a host's free site builder program or Dreamweaver (even the most up to date versions), produce an enormous amount of code bloat and deprecated code, i.e., center and font tags that will soon no longer be supported by some browsers and it will destroy your formatting. The code from these programs often will not validate and search engines may avoid your site depending on the errors. Check the code your program puts out with the W3C validator to see if your program puts out up-to-date code (I've never seen one that does).
Password protected web sitesSearch engines can't enter such pages because they don't have the password.
FramesSearch engines can't read the contents of sites built within frames. If you use frames you should also provide these same pages in non-frame versions (which increases the work load for the webmaster and cost for the client).
Image MapsLinks inside image maps will result in search engines not listing your site because they get trapped inside of them. You need to provide the same links in standard HTML somewhere else on the page--possibly in a site map or in the footer, however these won't rank as well as links higher up on the page.
Flash technology, because it is so image intensive, slows down computers that are on dial up, and will annoy those visitors to your site. Apple has prevented Flash from working on iPhones so Flash navigation on a website won't work for iPhone users. Some visually imparied people get physically sick watching animations and Flash presentations because of a problem with focusing their eyes. And most importantly many people are now turning off Flash in their browsers because it runs on Active-X which spreads trogans and viruses.
Dynamic HTMLSearch engines can't list sites totally designed with DHTML (classifieds, databases, etc.) because the pages are actually not even there. The pages are assembled from different parts and not visible unless someone searches for data. Other arrangements need to be made for the search engine to list them, such as the program generating static html page for part of the database.
DatabasesSearch engines can't get information from the server, only the web page (see dynamic html above).
Multimedia FilesMedia files are audio and video presentations. Any important text in these files cannot be indexed by most search engines.
FormsGoogle has recently figured out how to index the content in forms.
Large pagesAn acceptable page size used to be 40 K. It's probably higher now however both visitors and search engine bots won't wait for the page to load if it's too slow.
Capitals in File NamesPutting Capitals in your File Names can also cause a drop in keyword ranking because it causes a duplicate content issue in search engines.
A Hierarchy of DirectoriesSearch engines and crawlers will usually not dig deeper than 3-4 directories or folders so keep your most important information in the upper levels or the root level of your website.
Affiliate LinksSome search engines are beginning to ignore sites with Affiliate links and no original content, because it provides duplicate content and they are trying to reduce spam.
Java AppletsImportant information in Java Applets should also be provided on the text of the page because some of the older browsers can't read it. Also, if people have PopUps turned off in their browser they won't be able to view Java Applets either.
ImagesImportant information, such as titles of articles or your major keywords, should not be put into images unless it is also included in the text because search engines can't read images. This may seem redundant or repetitive to the normal reader but we're dealing with search engines here--not just people.
Text-only Browsers or Text-to-voice ConvertersThese are used by the blind. The same thing that stops these browsers will stop most search engine crawlers so it's a good idea to have all of your web sites tested for accessibility and provide an alt tag on all images and also view your site in a text-only browser (you can do this by finding your site in Google, clicking on the cache and then on the option for text only).
Template Driven Hosting CompaniesMost code put out by template driven hosting companies is run by software that is so old that the code is deprecated and will some day be no longer supported by newer browsers and thus will not validate and search engines will avoid your site.
If you would like your web site analyzed for keyword ranking
please check out the In-Depth SEO Analysis page. If you are looking for a web designer to set up a new website check out my Home Page.
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Technology that Blocks Some Search Engines
Dynamic Pages vs Static Pages
Maximize the Title Tag
How to Get Good Backlinks
Submitting websites to Search Engines and Directories
How Long Does It take to Rank in Google
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