In addition to what Jesse said, Svelte compiles to Vanilla JS and does not use the Shadow DOM. All the code is compiled and optimized to work directly on the actual (or 'light') DOM.
I also like the fact that you're using actual CSS in your Svelte components, and the compiler namespaces your CSS. You can also set it up to use various existing CSS frameworks (Tailwind, Bootstrap, Emotion, etc.) as well as PostCSS, PurgeCSS, etc.
Finally, using stores and events, communication and data-flow across components is very flexible and quite easy to use.
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