Jens Oliver Meiert • 9/10/2025

2025: 0 of the Global Top 200 Websites Use Valid HTML

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An annual analysis of HTML conformance on the home pages of the world's top 200 most visited websites finds that zero sites use completely valid HTML in 2025. The study tracks the degradation in markup quality over recent years, noting an increase in average and median error counts, and discusses challenges with validation tools.

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#Web Development #html #validation
2025: 0 of the Global Top 200 Websites Use Valid HTML

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