This thing is also available in level-triggered variants, so every time this pin is high, this data movement happens, but normally you use edge-triggered flip-flops.
One by one, the pairs of feet in front of Harry took the weight of their owners once more; hems of cloaks swung into sight, and Madam Rosmerta's glittering heels disappeared behind the bar.
His fingers moved absentmindedly to the little pouch still strung around his neck, thorough which he could feel the jagged mirror fragment in which he had been sure he had seen Dumbledore's eye.
Spurred to speed, Prissy hurried toward the back of the house while Scarlett scratched a hasty note on the margin of Gerald's last letter to her — the only bit of paper in the house.
You can see here that the clock goes high, but at the time here, the signal on D already needs to be high even before the clock occurs, the clock edge occurs.