https://github.com/webcomponents/webcomponentsjs https://github.com/webcomponents/webcomponentsjs - all frameworks use same polyfill. https://github.com/vuejs/

https://github.com/webcomponents/webcomponentsjs https://github.com/webcomponents/webcomponentsjs - all frameworks use same polyfill. https://github.com/vuejs/vue-web-component-wrapper https://github.com/vuejs/vue-web-component-wrapper "You will also need the Shady DOM + Custom Elements polyfill." from Vue docs. Same polyfills are used by svelte etc.