# Browser passport validation

From project root, Python 3.10+ stdlib only:

```sh
python3 experiments/0005-browser-matrix/check.py
```

`matrix.json` contains target recipes, resource ceilings, required run-record
fields and capability fallback rules. Normative measurement and permission
procedures: `docs/decisions/0005-browser-matrix.md`. Target OS families/stable
channels must be resolved to supported full builds before a real qualification;
archive full build identifiers, installer hash or Apple OS build, app and fixture
hashes, actual viewport and tool configuration. No browser binaries are supplied.

The checker rejects missing targets/reproduction fields/fallbacks, compiler floor
regressions, impossible RAM ceilings and missing iOS Home Screen mode. Negative
fixtures exercise those refusals; percentile fixtures verify nearest-rank p95.
It does not execute a browser, simulate a successful permission request, measure
resources, qualify hardware or prove a real fallback implementation. A passing
passport check must not be reported as passing production browser acceptance.