The full context, to avoid confusion: "because no major browser supported it back then and the majority of video playback devices were already smartphones (without vp8 decoding capabilities)"
No major browsers didn't support VP8 back then, and among the remaining devices (other appliances than PCs with those Browsers) the majority of video playback devices were already smartphones (not supporting VP8 in 2010).
No major browsers didn't support VP8 back then, and among the remaining devices (other appliances than PCs with those Browsers) the majority of video playback devices were already smartphones (not supporting VP8 in 2010).
Apologies for the lack of clarity.