WebComponents are an interesting set of browser APIs to implement entire applications from scratch. However: WebComponents were also designed for reuse, so you can easily include 3rd-party (like e.g. Vaadin) components with your application.
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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