Shameful plug here - and yes dc.js is great!
An alternative web-component based approach to dc.js is available here: https://github.com/PolymerEl/multi-verse.
It is still based on Polymer 2.0, migration to lit-element in the way.
i->o is a common typo; here it could be negating the intended meaning!
It also appears that your demo for multi-chart is:
1. Broken
2. Blocked by most browsers and requires manual override of security suggestions (probably related to https and some sort of cross-domain things going on).
I'd be curious to see any working examples like the one dc.js has on it's main doc page. Cheers
I launched this approx 2 years ago - using it in prod, but not had proper time to devote on better doc/demo/presentation. Looking forward to it during current migration to lit-element.