Revamped testbed

Frequency of flashing (flashing)

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

Gif exceeds flash per second limit:

This flashing gif flashes ~4 times every one seconds:

Video with quickly flashing red and white

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).