When I built the first version of our mouse tester, the obvious approach was a start screen: pick a test, click Start, then interact with a test area. That felt safe. It also made the tool feel like a form.
The problem showed up in the first few user sessions. People opened the page, moved the mouse, and nothing happened. They clicked the big button, but then weren't sure what counted as "inside" the test. Some clicked the Start button again. One person told me they clicked the Start button, then clicked the test area, and only later realized the first click was just part of the UI. Others assumed the tool was broken because the first click they cared about was the one that launched the test.
So we removed the start step entirely. The page listens as soon as it loads. Moving the mouse updates the cursor position. Pressing any button updates the button state. Scrolling updates the wheel readout. There is no "test mode" to enter or exit. If you opened the page, the test is already running.
That decision forced a few implementation details. We attach listeners at the window level instead of to a specific test box, because users naturally move outside the box while testing. We also listen to mousedown and mouseup rather than click for button state. Side buttons are the gotcha: many browsers fire press/release events for button 3 and 4 but don't give you a normal click event. If the whole test is built around click handlers, those buttons look dead.
The live page also made the double-click check more honest. Instead of asking users to "start double-click test", we show the timing between consecutive presses as they happen. Same for scroll: we show raw wheel deltas, because different browsers report lines versus pixels, and hiding that behind a single smooth number would be misleading.
The result is less UI, not more. No setup, no tabs for each test, no reset flow. The page is just a readout of what your mouse is doing right now. If something feels wrong, you click and watch the state change. A common reason people land there is a right-click or side button that stopped responding after a cable swap.
You can try the approach here: mousetester.novadailyhub.com. Open it, move the mouse, and you're already testing.
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