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I wonder if they are using browser detection instead of feature detection. I don't know when YouTube started feeling so sloppy with it's coding (Gmail has also

I wonder if they are using browser detection instead of feature detection. I don't know when YouTube started feeling so sloppy with it's coding (Gmail has also started feeling this way as it went very JS heavy). I am sightly biased against most JS in the presentation layer

JeremyBanks 7y ago
It didn't help that much of Google went all-in on Polymer when it was originally built on standards that nobody else was interested in implementing, ensuring that non-Chrome browsers got a laggy polyfilled experience. It remains an awful framework, and YouTube's tooling has been incredibly slow since migrating.