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HTML vs XHTML version statistics
As part of the online demo at try.powermapper.com we collect summary statistics about pages scanned by our service. One interesting statistic covers versions of HTML and XHTML in common use. As of March 2019:
- HTML 5 DOCTYPEs account for over 90% of pages scanned (up from 8% in 2011)
- XHTML 1.0 DOCTYPEs account for under 5% of pages scanned (down from 60% in 2011)
- XHTML 1.1 DOCTYPEs have vanished, and account for 0% of pages scanned (down from 1% in 2011)
- HTML 4.01 DOCTYPEs account for about 1% of pages scanned (down from 10% in 2011)
- About 2% of pages scanned have no DOCTYPE (down from 5% in 2011)
Timeline of web standards: 1994-2010
Web standards implementation process
The HTML 4.01 standard was introduced in 1999, but 11 years later, no major vendor fully implements it.
Controversial, perhaps, but also true. A lot of flak is rightly directed at Internet Explorer’s lack of standards support, but the other browser vendors aren’t blameless either. Here’s a partial list of some HTML 4.01 features not supported in Chrome, Firefox, Internet Explorer or Opera.