Frame Skipping Test

Run a numbered frame sequence for repeated long-exposure photographs that may reveal a consistently missing position.

This check opens a focused test surface. You can return with Escape. Review what this browser test can and cannot measure.

Before you start

  • Keep this tab visible and close heavy background work while the pattern settles.
  • Use a camera with manual shutter control or a long-exposure mode; screenshots cannot capture the sequence over time.

How to run this check

  1. Open the Frame Skipping Test and leave the numbered pattern running automatically
  2. Wait until the pattern state changes from WAIT to READY
  3. Enter fullscreen and steady a camera in front of the display
  4. Use a shutter time around 1/10 second or longer and take at least three photographs
  5. Look for a missing numbered position that repeats across otherwise consecutive trails

What this browser test can tell you

Can help you check

  • Whether repeated long-exposure photographs of the numbered browser sequence contain the same missing position while browser animation timing is stable.

Cannot measure

  • This test cannot automatically detect skipped hardware frames, certify a monitor overclock, or distinguish the display, cable, GPU, compositor, browser, and camera as the cause.
Setup, interpretation, and sources

Recommended setup

  1. Keep the tab visible, wait for READY, enter fullscreen, and steady the camera square to the display.
  2. Start near a 1/10 second shutter time, lower ISO or display brightness if the trail clips, and take at least three photographs.

How to interpret what you see

  • A normal capture shows one continuous run of numbered positions; the exact number and brightness of cells vary with shutter time and refresh cadence.
  • Treat a gap as suspicious only when the same missing position repeats in several otherwise consecutive photographs.
  • Rolling shutter, exposure settings, camera processing, browser scheduling, and operating-system composition can create misleading results.

Sources

Methodology reviewed:

Long-exposure camera pattern

Photograph the numbered sequence

The pattern is already running. Wait for READY, enter fullscreen, and photograph several consecutive trails with a steady camera.

WAIT
Browser cadence —
Timing stability —
Pattern state WAIT

Calibrating browser timing. No camera access or upload is used.

Camera setup

A screenshot captures one instant and cannot show this sequence. Use a real camera exposure that spans several refreshes.

  1. 1. Set the exposure

    Start around 1/10 second or longer. Manual or Pro mode is easiest.

  2. 2. Separate the cells

    Lower ISO, exposure, or display brightness if the trail becomes one white smear.

  3. 3. Repeat the photo

    Take at least three steady photographs and compare the sequence, not one image.

Typical capture

A continuous numbered run

123456789101112

The trail length changes with exposure. Consecutive positions matter more than the number of bright cells.

Recheck this pattern

The same gap repeats

1 2 3 4 5 6 7 8 9 10 11 12

One odd photo is not enough. Recheck only when the same missing position appears in several otherwise continuous trails.