Hold Space or an arrow key and observe its repeat rhythm. The test learns the usual interval, then flags longer gaps for closer inspection.
Watch for gaps in a held key’s auto-repeat events.
Hold Space or an arrow key. Keep holding while the tool learns your repeat timing, then watches for longer gaps.
The initial macOS repeat delay is excluded. After five repeat intervals, gaps are compared with a moving median. If letters open an accent menu, use Space or an arrow key. Scheduling, CPU load and macOS settings can cause gaps; this cannot confirm a physical key dropout. Charts and statistics retain the latest 300 samples.
Focus the test area and hold Space or an arrow key. The initial operating-system repeat delay is excluded. After at least five repeat intervals, the tool compares later gaps with a recent median baseline. Release the key between attempts.
The threshold controls how much longer than the baseline a gap must be to be flagged. CPU load, browser scheduling, macOS repeat settings and connection behavior can all change event timing. A long gap is an observation, not confirmation of a physical dropout.
Start with Space or an arrow key. macOS may show an accent menu for some letters, and accessibility settings may change repeat behavior. Compare a key that repeats in a text editor and review Keyboard settings. A quiet event stream does not establish a broken switch.
About the test, your keyboard, and that one key that won’t light up.
More answersNo. It observes gaps between browser autorepeat events while a key is held. The page cannot see a physical press that never generates an event or separate hardware interruptions from software scheduling.
Repeat the test with the page focused and a stable workload. Compare another application and, for external keyboards, another supported connection. Treat a persistent pattern as a troubleshooting clue.
From missed keys to double taps. Find the right Mac keyboard test for the job.
Hold one key. Check the delay before repeat and its steady rhythm.
One press, two letters? Look for unexpected double-typing events.
Meet every key. Check your MacBook or Magic Keyboard, one press at a time.
Explore event intervals and the rhythm of your keyboard input.
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