This is an example of what is needed for running the XML conformanc suite published by the W3C with Karma.
You can run the suite on Chrome with the Karma runner like this:
$ karma start [path to this package]/karma/karma.mocha.conf.js \
--browsers=ChromeHeadless \
--single-run \
--xml-driver=@xml-conformance-suite/js/drivers/dom-parser \
--xml-selection=@xml-conformance-suite/js/selections/chrome