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HTML Version Statistics

This page shows trends for HTML and XHTML DOCTYPEs for sites submitted to the online demo.

The HTML 5 DOCTYPE is now the most common, used on over 70% of pages
XHTML 1.0 has dropped from 60% of pages in 2008, to fewer than 15% of web pages today
HTML 4.01 has dropped from 20% of pages in 2008, to fewer than 3% of pages today
The total sample size is over 15 million pages, with around 250,000 new pages scanned a month

HTML Version Trends

Graph: HTML versions in use: HTML 5 accounts for over 70% of pages, XHTML 1.0 accounts for under 15% of pages and HTML 4.01 for under 3%

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>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">

Note: Data is anonymized and aggregated to show averages. No site specific data is ever shown.