MacBookPro with Safari.

sph · on July 20, 2020

Safari hasn't supported >1080p in years (because it blocks VP9 and Youtube has stopped offering higher resolutions in H264 that Safari supports)

ZeikJT · on July 21, 2020

Blocks VP9? Maybe it doesn't support it but blocking would imply it is built-in but forcibly disabled.

It does look like they're testing it since it's in tech preview [1] so once it's relatively-bug free they'll probably release it.

cbsmith · on July 20, 2020

Yup. Golden rule: don't use Safari for YouTube (or really for video content in general).