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Axe-core vs PA11Y: Which one should you choose?

• GitLab now offers Pa11y as part of its CI pipeline, with no configuration needed. Craig Abbott compares it to axe-core, which is used by Deque for its acceptance tests. Out of 142 issues tested:
  • axe-core found 39 issues in total, or 27%. 36 were violations and 3 were potential issues which required a user to check manually.
  • pa11y found 29 issues in total, or 20%.
  • 19 issues (13%) were found by both tools.
  • 20 issues (14%) were found by axe-core but not Pa11y.
  • 10 issues (7%) were found by Pa11Y but not axe-core.
  • Combined, 49 issues (35%) were found.
• Craig recommends using both tools. He also notes that axe-core isn’t necessarily ‘better’ than pa11y; the issues in the set that Craig tested with might just happen to play to axe-core’s strengths.

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