I really like this. It's a pretty elegant way to handle iframe content in particular. Will keep a keen eye on this project!
The issue we ran into in this area was with embeds that don't use iframes - generally it ends up being a third party script that needs innoculating (e.g. instagram / twitter embeds), with a bunch of associated dom content somewhere else on the page (the new facebook embeds work the same way).
The approach we've thus taken is to allow you to bundle related content together under a single "purpose" - when permission for that purpose is granted, all associated content gets unlocked.
The issue we ran into in this area was with embeds that don't use iframes - generally it ends up being a third party script that needs innoculating (e.g. instagram / twitter embeds), with a bunch of associated dom content somewhere else on the page (the new facebook embeds work the same way).
The approach we've thus taken is to allow you to bundle related content together under a single "purpose" - when permission for that purpose is granted, all associated content gets unlocked.
There's also a bunch more info on this over at the docs: https://metomic.io/docs/placeholders