From your link:

> Note: This proposal is currently inactive, with work having moved on to the component-model repo.

This is never getting done, is it... this is the fourth rewrite of such a feature.

Don’t be so dismayed. I’ve been following the progress and the move was a good one. It allows them to ship the thing most people care about.

These things take time. If all else fails just write a polyfill. Component model doesn’t add anything new runtime requirements that can’t be polyfilled