BCD Collector
What it does
Runs a large suite of feature-detection tests against a real browser and reports which APIs and properties are available. The output feeds directly into mdn/browser-compat-data as evidence for adding or updating compat entries.
Who is it for
BCD contributors who want to verify compat data in a specific browser version — especially useful when a new browser version ships or when coverage of a lesser-tested browser is needed.
Where to find it
Source at https://github.com/openwebdocs/mdn-bcd-collector.
Who is maintaining it
Originally built by Philip Jägenstedt at Google, now maintained by Open Web Docs contributors.