Is it about time the slots proposal was discussed here?
I feel like this is something we need as part of the shadow DOM so it would be great to help nudge it along.
I created a quick shim which could be modified to not use Shadow at all and generate slot functionality now:
In browsers that support Shadow already the template could be swapped out to use
Would turn into:
The other change of the code would need to account for DOM manipulation too (Which doesn't seem to be covered so well in the proposal).