I think you confused multiple things together - why do you bring webcomponents.org the website into discussion, it has no relation here. Web components are a l

I think you confused multiple things together - why do you bring webcomponents.org the website into discussion, it has no relation here. Web components are a low-level primitive - they are clunky to use directly. Polymer and LitElement - are libraries - you can author WC's with them. And yes they are different (I used both), but you don't really have to migrate from one to another. Web components are not divided - Lit-element can work within vuejs or polymer or angular for example. VueJS authored WC's can work within lit-element or polymer. https://custom-elements-everywhere.com/ https://custom-elements-everywhere.com/ - see this for more information about interoperability (sometimes it depends on templating syntax). You asked about Svelte and Stencil - https://svelte.technology/ https://svelte.technology/, https://stenciljs.com/ https://stenciljs.com/ - those compile your code into web components - different approach than polymer that is a suite of quite a few higher-level abstractions that you might not want to pay for (20kb of js).