Automatic Measurement of Output Accuracy

[OisinNolan]

• It would be great to have a measure for accname's accuracy calculated every time a PR is made.
• This could be done automatically with GitHub actions.
• The metrics could be Web Platform Tests as well as some field-test on real world HTML documents. We could write some scripts that run experiments and output results, which we can then display in a comment on the PR automatically.
• It may also be possible to compare performance with master to get a performance diff for each PR.

See, for example: https://github.com/marketplace/actions/comment-on-pr