GET/v1/scans/scn_01J…/diff?baseline=scn_01H…
baseline_scan_id = scn_01H…
scan_id = scn_01J…
profile = wcag-2.2-aa-web@1.2.0
match = deterministic fingerprint
3 new · 7 recurring · 4 resolved
Accessibility baseline comparison API for regressions
The accessibility baseline comparison API accepts a compatible prior scan ID as the baseline. It compares deterministic fingerprints so teams can isolate regressions without hiding accepted work or rewritten history.
For teams adopting accessibility controls in products with an existing issue backlog
Illustrative scan comparison
Illustrative- Baseline
- scn_01H…
- Current
- scn_01J…
3New
7Recurring
4Resolved
Decisionfailed · 2 new critical findings
- Match
- Deterministic finding fingerprint
- Classes
- New · recurring · resolved
- Baseline
- Compatible prior scan ID
Ask for the delta, not another disconnected export.
The comparison endpoint returns classifications beside the current finding identity and resolved technical profile.
Turn finding history into explicit release behavior.
A baseline is useful when every delta state has a named disposition instead of disappearing into one total count.
| Signal | Disposition | Owner |
|---|---|---|
| New fingerprint | Evaluate gate threshold | CI |
| Recurring fingerprint | Keep backlog assignment | Product team |
| Resolved fingerprint | Retain verification | Evidence archive |
| Changed profile | Review comparability | Accessibility lead |
Use new-only mode without erasing recurring work.
A project can block regressions today while the full backlog remains available for prioritization, remediation, and later threshold changes.
Illustrative decision
New critical findings crossed the release thresholdfailed- Gate scope
- New findings only
- Blocked
- 2 newly introduced critical findings
- Visible debt
- 7 recurring findings
- Improvement
- 4 resolved findings
Choose the technical profile behind this capability.
Baseline comparisons remain interpretable when both scans use compatible profile and rule versions. Pin that technical target before fingerprints are compared.
Block new regressions without erasing the existing backlog.
Compare a baseline and current scan in a free workspace, then bring the same fingerprints into a release gate when the team is ready.
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Automated preflight is not an accessibility certification or legal determination.