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ValidateHTML audit of top 5,000 websites finds nearly 90 percent serving invalid HTML, with screen readers bearing the cost
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An independent audit of the 5,000 most-trafficked web domains found 87.2 percent contain HTML spec violations, with over a third failing accessibility checks.
Browser error recovery masks markup problems for sighted users but breaks assistive technology that lacks the same tolerance. The most common violation, incorrect tag nesting, originates in front-end framework build output rather than hand-written code, making it a tooling problem teams may not even know they have.
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ValidateHTML examined 5,000 top web domains and found 87.2 percent violate HTML or CSS specs, with only 2.6 percent fully clean of errors and warnings.
Over a third of sites failed accessibility checks, with 41.6 percent missing ARIA labels and 20.4 percent missing alt text on images.
The most common failure, incorrect tag nesting, appears in over 59 percent of sites and is introduced by front-end frameworks at build time.
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