Comment by psteeleidem

Web components do not have a great story about passing complex data. If you want to pass typed data (not just strings) then declarative HTML suffers since HTML parses all attribute values as strings. You can use JavaScript properties to provide typed data to Web component custom elements, but properties cannot be provided declaratively in HTML and now you have two ways of providing data. With that said, I think there is value in building UI components in Marko and offering web component custom elements as one option for embedding your Marko-based UI component into a page (using a small UI bridge layer... something that we plan on open sourcing). --Marko author