Comment by no_wizard
11 hours ago
Decoupling slots from shadow dom would make custom elements even better.
I love custom elements. For non React.js apps I use them to create islands of reactivity. With Vue each custom element becomes a mini app, and can be easily lazy loaded for example. Due to how Vue 3 works, it’s even easy to share state & routing between them when required.
They should really move the most worthwhile features of shadow dom into custom elements: slots and the template shadow-roots, and associated forms are actually nice.
It’s all the extra stuff, like styling issues, that make it a pain in the behind
There's really no way to decouple slots for shadow roots.
For slots to work you need a container for the slots that the slotted elements do not belong to, and whose slots are separated from other slot containers. Otherwise you can't make an unambiguous relationship between element and slot. This is why a shadow root is a separate tree.
Agreed. The way I explain it is: suppose you have a `<super-table>` element, and you have a child slot called, for example, `<super-row-header>`. Presumably you want to write some JS to transform the slotted content in some way, decorating each row with the header the user provided.
But, if you do that, what happens to the original `<super-row-header>` element that the user provided? Maybe you'd want to delete it…? But how can you tell the difference between the user removing the `<row-header>` and the custom element removing it in the course of its work?
What you'd need is for `<row-header>` to somehow exist and not exist at the same time. Which is to say, you'd have one version of the DOM (the Light DOM) where the slot element exists, and another version of the DOM (the Shadow DOM) where the `<row-header>` element doesn't exist, and the transformed content exists instead.
It's clever, I guess, but the drawbacks far outweigh the benefits.
Client-side components inherently require JS anyway, so just use your favorite JS framework. Frameworks can't really interoperate while preserving fine-grained reactivity (in fact, Shadow DOM makes that harder), so, just pick a framework and use it.