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Accessibility conformance testing rules for HTML
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.circleci chore: update dependencies & change cache to package-lock.json i… (#728) Aug 6, 2019
.github chore: update github templates (#648) Jul 4, 2019
__deprecated__ fix: update refs of glossary (#682) Jul 17, 2019
_rules feat: Define implicit/explicit role (4e8ab6, b20e66, c487ae, e086e5, … Aug 14, 2019
build fix: implementations to show correct results and highlight incomplete… Aug 15, 2019
gatsby chore: run prettier (#688) Jul 19, 2019
pages fix: test should look for actual key over filename (#777) Aug 14, 2019
src fix: implementations to show correct results and highlight incomplete… Aug 15, 2019
test-assets fix: add test asset for rule "descriptive headings" (b49b2e) (#629) Jul 2, 2019
test-utils chore: test if composite rules only refer to atomic rules as `in… (#722) Aug 2, 2019
utils chore: refactor functions (#686) Jul 18, 2019
.DS_Store DRAFT: SC1-2-video-element (#106) Jun 6, 2018
.gitignore fix: test if definition for all referenced glossary terms exist (#634) Jul 17, 2019
.prettierrc chore: WCAG ACT RULES CG Website Update (#437) Apr 15, 2019 Composite rules: Fix broken links in expectations (#627) Jul 2, 2019
gatsby-config.js Update implementation documentation (#576) Jun 11, 2019
gatsby-node.js fix: add earl context (#710) Jul 25, 2019
package-lock.json chore(deps): bump act-rules-implementation-axe-core (#790) Aug 16, 2019
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yarn.lock chore(deps): bump act-rules-implementation-axe-core (#790) Aug 16, 2019

ACT-Rules Community repository

The ACT-Rules Community repository is where the ACT-Rules community group maintains the rules they designed for (semi-)automated accessibility testing. Within the rules directory you will find all the rules recommended by the ACT-Rules community group for implementation in automated test tools.

Visit the ACT-Rules Rules community website for the latest rules and drafts.

Related W3C Activities

The ACT-Rules Community Group is the primary contributor of rules to the Accessibility Conformance Testing (ACT) Taskforce for the W3C. The ACT Taskforce is currently developing the standard around which rules can be created, and is planning to put together a suite of rules on how WCAG 2 (and beyond) should be tested.

For more information, see ACT Overview - What is ACT.

Write rules, not tools

An ACT rule is a unambiguous description of what the results of accessibility test tools and methodologies be when running a conformance test for the Web Content Accessibility Guidelines. The rules are written without a specific implementation in mind. The goal is not to create an accessibility test tool. Instead we aim to harmonize between existing tools, and improve their transparency and the overall quality of their results.

If you want to know more about us, visit our website at:

Implementing ACT Rules

Anyone developing their own accessibility testing tool or methodology is free to based this on the ACT-R Community rules. We encourage you to document any deviations from those rules if you do so, and make these changes known to your users.


Contributing is open to anyone. We welcome any pull requests for changes. We ask that you make changes to pull requests only for drafts. Before contributing new rules, we recommend you checked their validity with several experienced accessibility auditors first. This helps you identify potential stumbling blocks early in their design.

ACT-R has conference calls every 4 weeks. If you are interested in becoming an active contributor or reviewer, we ask that you join the ACT-R community group through the W3C Website. This requires setting up a W3C account, may require approval by the organization you work for if they are a W3C member.

Join the ACT-Rules community group now! or visit for more information.

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