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As far as i understand, Polymer (and Web Components, in general) permits to define custom HTML elements.

What kind of custom elements are in the (insanely unreadable) Youtube main page?

The Polymer philosophy appears to be more of "make everything a custom element", i.e. up to the entire app (e.g. "<youtube-app/>", "<comments-section video-id=''/>", "<related-videos video-id=''/>", etc.).

Did YouTube switch to Polymer yet? I think only the new design (https://www.youtube.com/new) uses it, and it's not yet switched on by default?

Google do staged rollouts, I got the new YouTube design last week

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