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What happens when different modules register custom elements with the same name?

There are various techniques you can apply in these cases. Like deduplicating dependencies or apply a build/babel plugin that makes sure the names are unique.

Imho scoping elements at the template/element level sounds more promising. Here is an experiment archiving exactly this https://open-wc.org/scoped-elements/ There are still some improvements to be made but it's actively been worked on - so something lion might consider in the future.

That's great, that would've saved us so much trouble back when I worked with Web Components with many different teams. The problem it describes are exactly what we ran into, and solution 2 was extremely painful in terms of overhead and being demotivating:

> Synchronizing updates of shared dependencies - e.g. make sure Team Blue & Team Green always use the same version when releasing. This can be a viable solution however it comes with a high organizational overhead and is hard to scale up (for 10+ teams)

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