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SpecsUpdate
Pros
Pro Based on W3C's web components
Web Components are a collection of specifications released by W3C as a way to reduce the complexity of web apps by creating reusable components. Browser support is currently poor for web components, however Polymer is developed to make web components compatible with modern browsers.
Pro Component based
Polymer apps are component based. You have to break down the layout of your UI into components, which makes it easier to understand how every part of the application works and how they relate with each other. This way it's also easier to maintain the application.
Cons
Con Abandoned or neglected
Google made it but doesn't support or work on it. lit-element suppose to continue it yet not much progress as other frameworks.
Con Slow performance in mobile
Since most mobile web browsers don't have a very powerful JS engine, Polymer can be a little slow for mobile devices.
Con No server side rendering
Polymer does not support server-side rendering. This results in higher loading times, more HTTP requests and it's not very SEO friendly, since search engines have no way of indexing a page if it's not rendered in the server.
Con Compatible with only some of the latest browsers
Polymer is still very much in development and it yet doesn't support some older browsers. It doesn't even support IE 10.
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