Svelte - https://svelte.technology/ has components written in HTML. It's compiled to vanilla javascript, which results with components that are faster, use less memory, & have a smaller payload.

Also, Svelte is easier to work with. A simpler API, Computed Properties, events. The Svelte Store is also nice. I'm forced to use React in a project, but I prefer to use the Svelte Store opposed to Redux or MobX.