У вашего броузера проблема в совместимости с HTML5
Keep in mind that we have a complete set of CN 1-12 on the left and right side. Here, I show some of the left and some on the right for the sake of clarity.
I (olfactory)
II (optic)
III (oculomotor)
IV (trochlear)
V (trigeminal)
VI (abducens)
VII (facial)
VIII (vestibulocochlear)
IX (glossopharyngeal)
X (vagus)
XI (accessory)
XII (hypoglossal)