We used @w3cdevs machine-readable references `webref/idl` (github.com/w3c/webref) to query the specs for this! Long-term we hope to integrate more specification sources directly into MDN, so the docs are always up to date!
Rachel explains how to interpret the Interop 2022 dashboard, and how the results are built from test results and used to track progress. The dashboard scores represent how browser engines are doing in 15 focus areas and 3 joint investigation efforts: wpt.fyi/interop-2022