> E4X had the unfortunate downside of returning actual DOM instances, which needed to be updated imperatively Firefox never shipped the optional E4X DOM APIs.

> E4X had the unfortunate downside of returning actual DOM instances, which needed to be updated imperatively Firefox never shipped the optional E4X DOM APIs. I wrote a polyfill for them at the time.[1] 1. https://github.com/eligrey/e4x.js/blob/master/e4x.js https://github.com/eligrey/e4x.js/blob/master/e4x.js