This page shows trends for web standards compliance across sites
submitted to this service. Over 40% of pages are valid HTML or XHTML,
compared with 25% in 2008.
Valid HTML / XHTML Pages
Percentage of pages that validate against DOCTYPE.
What is a DOCTYPE?
A Document Type Declaration, or DOCTYPE, is a piece of HTML code that says which version of HTML is being
used. For example:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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