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The Automated Accessibility Coverage Report (PDF)

• Thanks to GDS colleague Anika Henke, who discovered this report via the “Accessibility Testing Coverage: Automation and Intelligent Guided Testing” talk at axe-con. According to the report, Deque’s accessibility testing engine axe-core finds 57.38% of accessibility issues, rather than the “widely accepted belief that automated accessibility testing only provides 20-30% of accessibility testing coverage”.
• The discrepancy comes from theory vs practice. The 20-30% figure is the proportion of all possible accessibility issues that can be detected with tools, whereas the 57% figure comes from issues actually found on these sample websites.
• In addition, the 20-30% figure only counts unique issue types, whereas the 57% figure takes into account the number of times each issue occurs. In other words, if an issue that can be detected with automated tools accounts for a large proportion of all accessibility issues in the wild, then it’s reasonable to conclude that automated tools do in fact detect a larger proportion of accessibility issues than theorised. Deque hopes that this report will “remove the stigma attached to automated testing”.
• It’s worth noting that Deque analysed new client sites in getting the statistics for this report, which is based on the analysis of over 13,000 pages.

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