L3因为是人车共驾，责任划分、保险赔付等方方面面都需要考虑到。而L4不存在这个问题，出了事就是厂家负责。因为责任明晰，所以落地争议也较少，这就是现状。但是只要法律层面解决L3的责任划分问题，大规模普及也并不是遥遥无期。
On top of this, fermaw was likely switching to assigning audio sources via srcObject rather than the src attribute. srcObject accepts a MediaStream or MediaSource object directly, bypassing the standard URL assignment path that’s easier to intercept.
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Animations — FadeIn/Out, Create, Transform, Write, GrowFromCenter, AnimationGroup, LaggedStart
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