javascript - Youtube.com built with? -


recently youtube gives me option change theme. think youtube launches new theme. checking code (front end). looks angular, not sure angular or else.

is angular code ? if yes version is?

or

its else?

thank attention. :)

enter image description here

they don't use angular.

they use custom js "framework", , navigation , dynamic updates use called spf (structured page fragments):

http://youtube.github.io/spfjs/


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