YouTube today touted a first in web video as it became the first to support greater-than-HD video. It can now handle movies up to 4K widescreen, or 4096x3072; the resolution is about four times larger than 1080p and is dense enough to remain sharp at distances that would normally be reserved for 4K projectors. It can also handle intermediate steps such as 2K and is invoked just by choosing the original video size.
