Only 4.13% of the web’s code is valid!

03 November 2008

A new study from Opera finds that the overwhelming majority of web sites don't adequately support web standards. The good news is that compared to previous studies, more web sites are valid today than they were in previous years. The bad news is that just 4.13% of the URLs included in the studies sample size — which was over 3.5 million web pages — passed the W3C validator.

The results came from Opera's “Metadata Analysis and Mining Application” (MAMA), a search engine that “indexes the markup, style, scripting and the technology used while creating Web pages.” Opera engineers and data miners can then ask the search engine questions like, “how many sites use CSS?” (the answer is 80.4%) or, “how many markup errors does the average site have?” (it's 47).

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