you're right, they used Polymer and Material Design for the frontend in combination with the spfjs framework, which was introduced in 2014. https://youtube.goo

you're right, they used Polymer and Material Design for the frontend in combination with the spfjs framework, which was introduced in 2014. https://youtube.googleblog.com/2017/05/a-sneak-peek-at-youtubes-new-look-and.html https://youtube.googleblog.com/2017/05/a-sneak-peek-at-youtu... https://github.com/youtube/spfjs https://github.com/youtube/spfjs https://www.youtube.com/watch?v=yNe_HdayTtY https://www.youtube.com/watch?v=yNe_HdayTtY