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a11y-evidence-engine

v0.1.0

Published

Headless accessibility evidence engine with prov-spec provenance

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

mikefrilotmikefrilot

Keywords

accessibilitya11ywcagprovenanceprov-specevidencetestingheadless

Readme

a11y-evidence-engine

Headless accessibility evidence engine that emits prov-spec provenance records.

Designed to pair with a11y-assist: this engine finds issues and captures verifiable evidence; a11y-assist turns those findings into fixes.

Features

  • Deterministic output: Same input always produces identical findings and provenance
  • prov-spec compatible: Every finding includes cryptographically verifiable evidence
  • CI-friendly: Exit codes designed for automation
  • No browser required: Pure static HTML analysis

Installation

npm install -g a11y-evidence-engine

Usage

# Scan a file or directory
a11y-engine scan ./path/to/html --out ./results

# View help
a11y-engine --help

Output

results/
├── findings.json                    # All findings with metadata
└── provenance/
    └── finding-0001/
        ├── record.json              # engine.extract.evidence.json_pointer
        ├── digest.json              # integrity.digest.sha256
        └── envelope.json            # adapter.wrap.envelope_v0_1

Exit Codes

| Code | Meaning | |------|---------| | 0 | No findings with severity error | | 2 | At least one error finding | | 3 | Internal engine failure / invalid input |

Rules (v0.1.0)

| Rule ID | Description | |---------|-------------| | html.document.missing_lang | <html> element missing lang attribute | | html.img.missing_alt | <img> element missing alt attribute | | html.form_control.missing_label | Form control missing associated label | | html.interactive.missing_name | Interactive element missing accessible name |

Provenance

Each finding includes three prov-spec records:

  1. record.json: Evidence extraction using engine.extract.evidence.json_pointer
  2. digest.json: SHA-256 hash of canonical evidence using integrity.digest.sha256
  3. envelope.json: Wrapped result using adapter.wrap.envelope_v0_1

These records are independently verifiable without trusting the engine.

License

MIT