See https://developer.mozilla.org/en-US/docs/Web/API/Document/currentScript and https://github.com/metabrainz/musicbrainz-server/blob/7518086eca0511edd6d3985df95a24a8634445c6/root/static/scripts/work.js#L84

We could probably just add an ID to the script element, or use the workaround mentioned in http://www.2ality.com/2014/05/current-script.html