Frame Skipping Test
Photograph a browser-timed frame sequence and look for repeatable gaps in valid READY captures.
Frame Skipping Test camera pattern
Wait for READY, then photograph the moving block pattern with a camera.
While READY, each accepted browser frame advances exactly one consecutive slot. Browser timing never inserts a visual gap.
- Wait for READY.
- Use a camera. Photograph the moving blocks.
- Use about 1/10 s or longer. Several blocks should appear.
- Screenshots do not work.
- Look for repeatable gaps in valid READY photos.
Repeatable gaps across multiple valid READY photos may indicate display skipping. Camera exposure or photographing outside READY can also produce a bad capture.
Frame Skipping pattern is warming up browser timing.
How this frame skipping test works
The browser first waits for a stable requestAnimationFrame cadence. While READY remains valid, every accepted browser frame advances the bright block by exactly one consecutive slot. Browser timing is used only to decide whether the camera pattern is trustworthy; it never inserts a visual gap to simulate a skipped refresh.
Why a camera photo is required
A long-exposure camera photo can record several displayed pattern states in one image. A screenshot only captures the browser’s current rendered state and cannot show whether the physical display actually presented every refresh. Use roughly 1/10 second or longer so several block positions can appear in one photo.
How to interpret gaps
A repeatable missing position across multiple photos taken while the page says READY may indicate that the display did not present every pattern state. One bad photo is not a verdict: camera exposure, motion, timing instability, or photographing after READY was lost can also produce misleading gaps. This page does not automatically pass or fail the monitor.