The September 2026 update to the W3C Accessibility Guidelines (WCAG) 3.0 introduces a significant change to its proposed conformance model. Published by the World Wide Web Consortium (W3C) on September 10, 2026, the updated Working Draft has some interesting inclusions.
The update clarifies how supplemental requirements, assertions, and tags can help organizations and policymakers address different accessibility needs.
Important: WCAG 3 still remains a working draft, not a finalized standard. Its requirements and conformance approach may change as development continues.
A New Approach to Conformance
The most significant change is how WCAG 3 proposes to define and report conformance.
Earlier drafts explored different ways to provide flexibility within conformance. The September 2026 draft instead separates core conformance requirements from additional accessibility improvements and reporting.
- One conformance level: The proposed model establishes a single conformance level based on meeting all core requirements.
- Reporting tiers: Organizations can report their progress toward conformance and achievements beyond it.
- Greater policy flexibility: Regulators can use tags to select requirements appropriate to different contexts and levels of risk.
This approach aims to make conformance easier to understand while encouraging organizations to improve accessibility beyond the minimum requirements.
Four Tags and Six Reporting Tiers for Prioritizing Accessibility Requirements
The September draft introduces four tags for classifying core requirements according to the consequences of failing to meet them.
- Physical harm tag: A failure could cause immediate physical harm to a person with a disability.
- Risk tag: A failure could unreasonably increase financial, medical, legal, privacy, or security risks.
- Barrier tag: A failure could prevent someone from proceeding.
- Friction: A failure could make an interaction more difficult or hinder progress.
These tags will help distinguish the impact of different accessibility barriers. They will also support reporting tiers and allow organizations to select requirements relevant to specific contexts.
Tier 1: covers physical harm and risk requirements.
Tier 2: focuses on barrier requirements.
Tier 3: manages friction requirements (all core accessibility requirements).
Tier 4 and 5: add supplemental accessibility requirements and content assertions (more of them at Tier 5).
Tier 6: covers organizational assertions (for example, the procedures they follow).
The idea is to make the accessibility reporting more honest.
Clear Separation of Core and Supplemental Requirements
The updated approach distinguishes between requirements that determine conformance and additional measures that support broader accessibility.
- Core requirements: All must be met to conform to WCAG 3. The draft builds on WCAG 2.2 Level A and AA success criteria.
- Supplemental requirements: Address additional accessibility needs that may not apply to every situation or may be difficult to measure objectively.
What has not changed?
The September 2026 update does not replace WCAG 2.2 or introduce a finalized compliance obligation under WCAG 3.
WCAG 2.2 remains the current standard organizations should use to guide their accessibility work. W3C recommends meeting WCAG 2.2 success criteria as the best preparation for WCAG 3. The eventual WCAG 3 standard is expected to take longer to complete, and WCAG 2 will remain in use longer after WCAG 3 is finalized.
What should organizations do now?
Organizations should continue their existing accessibility strategy.
- Maintain WCAG 2.2 compliance efforts: Continue accessibility audits, remediation, and testing against applicable requirements.
- Monitor the draft: Review future W3C updates, particularly changes to the proposed conformance model.
- Assess broader accessibility needs: Identify barriers that may remain even after core requirements are met.
- Prepare for clearer reporting: Keep records of testing, remediation, and accessibility improvements to support future reporting needs.
Wrapping Up
The September 2026 WCAG 3 draft marks a major shift toward a single conformance level, impact-based requirement tags, and six proposed reporting tiers. However, the approach remains under development and should not be treated as a finalized compliance framework.
Organizations should continue prioritizing WCAG 2.2 compliance while monitoring WCAG 3 developments to prepare for future accessibility requirements.
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