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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 September 2016:
- HTML 5 DOCTYPEs account for around 75% of pages scanned (up from 0% in 2008)
- XHTML 1.0 DOCTYPEs account for around 10% of pages scanned (down from 60% in 2008)
- XHTML 1.1 DOCTYPEs have vanished, and account for 0% of pages scanned (down from 1% in 2009)
- HTML 4.01 DOCTYPEs account for about 3% of pages scanned (down from 20% in 2008)
- About 2% of pages scanned have no DOCTYPE (down from 15% in 2008)
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.
HTML vs XHTML part 2
In 2006 we converted our site from HTML 4.01 to XHTML 1.0. It seemed like it should be straightforward. After all, we reasoned, XHTML 1.0 is compatible with HTML so it should just be a case of changing the doctype from HTML to XHTML. Wrong.
HTML vs XHTML part 1