Re: [w3c/webcomponents] Support /deep/ in static profile (bugzilla: 28591) (#78)

>  If you are suggesting to use the {attached,detached}Callbacks to build some sort of internal map and keep track of every instance, then that is exactly what would be nice to avoid and rely on `querySelectorAll` for.

I'm saying that providing such an API is undesirable because looking for all elements in the composed tree with `querySelectorAll` would be **extremely** inefficient and expensive.

A better approach would be for each component to keep track of their subcomponents within its shadow tree (e.g. at construction time), and recursively call `draw` on them.  Alternatively, adding some sort of a option to `MutationObserver` so that it can track new elements of a given type being added to a shadow tree might work.

---
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/78#issuecomment-222860179