I don't think "lifting the toes" is actually dorsiflextion.
Depends on what you mean by "lifting the toes". Sitting with my feet flat on the floor, I can raise just my toes by flexing at the ball of my foot. That wouldn't be dorsiflexion. But I can also lift my toes by keeping my foot straight and lifting everything leaving just my heels on the ground. That would be dorsiflexion.
The same applies standing, but now you can also dorsiflex by moving your shins (and knees) forward, rather than lifting your feet so that you're only on your heels.