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Low Text to HTML ratio indicates little content for search engines to index.
We consider it to be good practice to have a Text to HTML ratio of at least 10% and ideal above 20%Keywords density and consistency are notable factors for optimal page SEO.
A 404 is a standard http response code for a resource that cannot be located on the server.
It is best to avoid frames and inline frames whenever possible (searchenginewatch.com/article/2064573/Search-Engines-and-Frames).
If frames must be utilized consider Flash and other reach-media technologies should primarily be utilized for decorative purposes.
Keyword density of above 6% can indicate that the word or a phrase appears too many time in the content.
It is not recommended to use frames or iframes because they can cause problems for search engines.