HTML & CSS Error Statistics: We Validated the Top 5,000 Websites

Only 2.6% of the most visited websites have fully valid HTML

We ran our validators over the Tranco top 5,000 sites. 90.5% of the 2,655 we could reach break the HTML spec. Full ranking of every error, with real frequencies.

31 points by theo_dcrx 70 days ago validatehtml.com 38 comments

Summary

A recent analysis of the top 5,000 websites reveals that a staggering 90.5% fail to comply with HTML specifications. The report details the types and frequencies of errors found, highlighting the widespread issue of invalid HTML across popular sites.

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