No visual content (e.g., animations, videos, images) causes the page
to flash more than three times in any one-second period. This applies
to all content, regardless of its purpose.
This test case has flashing lights
Div exceeds flash per second limit:
This flashing div flashes ~4 times every one seconds:
Note: Hard to automatically test/detect. A human tester or AI is required
to visually confirm that the flashing content does not exceed 3 flashes
per second (i.e. 3hz).