They don't seem to match browser behavior, for one thing: as far as I can tell, the spec requires the style attribute to be parsed, but not applied. How that's supposed to interact with .style manipulation is a mystery.

Furthermore, there's some confusion about cloning. Spec says a clone should not have its style attr applied, as far as I can tell, but at least some browsers do apply it, and there are web platform tests testing that it gets applied; see web-platform-tests/wpt#5614

Please get this sorted out and bugs filed on browsers as needed....

// cc @mikewest