Free-Spin Scroll Test

Free-spin commonly describes a wheel mode with little ratchet resistance, allowing momentum to continue after the finger releases. Product interfaces may call related behavior infinite scroll, hyper-fast scrolling, smooth wheel, or free scrolling. Those names do not define a web standard. The free spin mouse wheel test records only the WheelEvent sequence exposed to this page, so it can describe an activity tail without confirming a wheel mechanism, bearing, encoder, or manufacturer mode.

Ratchet mode usually creates more deliberate tactile steps, while free-spin may create a dense burst and a longer decay. Driver and operating-system processing can make the browser patterns overlap. The optional notched comparison is therefore a separate run, not an automatic classification. Use the same direction, browser, and settings, reset between runs, and describe the observed difference instead of declaring that one trace proves a particular product feature.

The session starts only after you press Start and captures events only in the focused area. Every sample retains elapsed time, delta axes, deltaMode, and modifier states in a bounded buffer. Pressing Released wheel saves the current elapsed time. The listener remains active until the selected quiet period passes after the most recent event or you finish manually. Quiet time is a protocol setting, not evidence that the physical wheel stopped at that exact instant.

A 100 ms bucket combines absolute deltaY for the decay chart and counts events for the peak browser event rate. The chart marks the user release and session end. A steep early peak followed by smaller buckets is one possible decay shape; an irregular shape may reflect input technique, browser scheduling, driver processing, or a change in direction. The visualization reports the trace and avoids animations that could obscure individual changes.

Total captured duration spans the first through last browser event. User-marked release time is your button press, while events before and after release divide the samples around that marker. Active tail duration measures from the marker to the last captured post-release event. Peak browser event rate is the busiest chart bucket converted to events per second; it is not USB polling rate or the wheel's internal scan rate.

Median interval describes typical event spacing, and p95 interval highlights a slower edge without letting one maximum dominate. Peak absolute delta and cumulative absolute delta remain raw values grouped by deltaMode. Pixel, line, and page totals stay separate because they are incompatible units. Reverse candidates have a sign opposite the run's dominant direction, but they do not by themselves identify encoder failure, bounce, or wear.

People use an infinite scroll wheel test when a long document stops sooner than expected, when momentum feels different after a driver update, or when two wheel modes need a repeatable browser-level comparison. Web developers can inspect whether a virtual list receives a burst and a long tail. Support teams can compare a run before and after reconnecting a device. Reviewers can publish a transparent trace rather than an invented revolution count or unsupported distance estimate.

This hyper fast scroll test also helps distinguish a wheel-tail question from page performance. If the chart continues but content stutters, the application may be doing expensive work. If events end cleanly here but another app keeps moving, application inertia may be involved. These are troubleshooting directions, not diagnoses. Pair this tool with the scroll speed test, sensitivity test, comparison test, or raw wheel event tester depending on the question.

The browser cannot know the instant of finger release, physical spin duration, wheel revolutions, circumference distance, encoder resolution, or device model. Background throttling, lost focus, modifier keys, natural scrolling, battery state, wireless conditions, drivers, and system line settings can alter the stream. Even with the same setup, hand force varies. Treat repeated, similarly shaped sessions as stronger evidence than one dramatic spin.

For better repeatability, use a stable grip, choose one direction, avoid touching the wheel again after release, and press the marker promptly. Keep browser zoom and system settings fixed. If auto-stop occurs too soon, select a longer quiet gap before the next run. If the page sees nothing, verify pointer position and focus, try the wheel event tester, and compare another browser. Never spin so aggressively that the device or your hand is at risk.

The free-spin scroll test processes raw samples and draws its lightweight SVG chart locally. A completed summary can be saved on this device only when you use the opt-in save control. No account is required, and the test does not fingerprint a mouse model or inspect operating-system sensitivity. Reset clears the current in-memory run so a ratchet comparison begins independently.

This free spin mouse wheel test describes browser-received input in the present device, driver, operating-system, settings, browser, and user-action context. It is not a definitive hardware diagnosis or a manufacturer benchmark. Consult the testing disclaimer and official device guidance before making repair, warranty, or purchasing decisions from an unusual tail.