Extract WebDriver commands and capabilities

[dontcallmedom]

WebDriver defines commands as a combination of HTTP verbs and URI templates, and capabilities (pair of key values), which a number of specs with specific automation needs extend.

webref/ed/links$ grep -l dfn-extension-command *
background-fetch.json
generic-sensor.json
js-self-profiling.json
mediacapture-automation.json
reporting-1.json
secure-payment-confirmation.json
storage-access.json
webauthn-3.json

webref/ed/links$ grep -l dfn-extension-capability *
webauthn-3.json

(also noticed https://w3c.github.io/permissions-automation/ that would need to be added to that list)

It would be nice if we could collect this data across tracked specs; might help with automated testing of these extensions (if that's a thing) and validate they're not inconsistent or overlapping.

[dontcallmedom]

a possible format for publishing the commands is OpenAPI/Swagger; someone has apparently already done the job of converting the selenium API (which I guess ≈WebDriver)