Mouse / Touch Input Test

What is this tool?

The Mouse / Touch Input Test is a single interactive surface that reports whatever pointing device you use in real time. It listens to the browser's mouse, wheel and touch event streams and draws the result as live indicators rather than storing anything.

For a mouse it shows which of the left, middle and right buttons are pressed, the cursor's X and Y position relative to the surface, scroll-wheel movement and direction, and a running click count that makes an unreliable or chattering switch obvious. Right-click is captured so the context menu does not interrupt the test.

For a touchscreen it tracks every active contact at once — numbered markers with their own coordinates and radius, the current number of touch points, and the peak number of simultaneous contacts, so you can confirm how many fingers the digitiser registers.

How to use it

1. Move onto the test surfaceMove the cursor over the workspace, or touch it. Input Type switches to Mouse or Touch as soon as the first event arrives, and the pointer indicator follows your position.
2. Test each mouse buttonPress left, middle and right in turn. Each button lights while held and releases when you let go; the right-click menu is suppressed so the switch itself can be checked. The click count rises with each click.
3. Test the scroll wheelScroll up and down over the surface. The scroll readout accumulates wheel movement and shows the current direction. Page scrolling is intentionally blocked while the pointer is over the surface so the wheel can be read.
4. Test multi-touchOn a touchscreen, place several fingers on the surface. Each contact gets a numbered marker with its own coordinates and radius; Touch Points shows the live count and Peak Touches records the most you managed at once.
5. Reset or go fullscreenFullscreen enlarges the workspace for finer tracking; Reset clears the counters and coordinates so you can start a clean check.

What the results mean

Button indicators

Left, middle and right read Pressed while their button is held and Released otherwise, taken from mousedown / mouseup with the event's button number. A release detected anywhere on the page clears a stuck indicator.

X / Y position

The cursor's coordinates relative to the surface's top-left corner, clamped to the surface. Useful for confirming the pointer moves smoothly and reaches every edge.

Scroll value and direction

Accumulated wheel delta with a Scrolling Up or Scrolling Down label, so a wheel that skips, sticks or reports in the wrong direction shows up immediately.

Click count

A simple running total of clicks. A single deliberate click that registers as two is the signature of a worn or double-clicking switch — the dedicated double-click test looks at this more closely.

Touch points and peak touches

The number of contacts on the screen right now and the highest number seen this session, which is how you confirm a panel's advertised multi-touch limit.

What it can detect

• A mouse button that fails to register or stays stuck down
• A scroll wheel that skips, sticks or reports the wrong direction
• Cursor tracking dead zones or jumps across the surface
• A double-click fault, where one press is counted as two
• How many simultaneous touch contacts a touchscreen actually reports

Limits worth knowing

A browser can only report what the platform gives it. These are the honest boundaries of this page, so a result is never read as more than it is.

• This reads browser input events, not the hardware directly. Polling rate, pointer acceleration and OS-level smoothing all sit between the device and what the page sees.
• The maximum number of simultaneous touches is set by the digitiser and the browser, so a low peak on a cheap panel is the hardware's limit, not a bug in the test.
• Wheel and touch handlers block page scrolling while you are over the surface so the gestures can be measured; move off the surface to scroll the page normally.
• Extra mouse buttons beyond left, middle and right, and gestures a driver handles internally, may never reach the browser as standard events.

Tips

• If a click registers twice, take that suspicion to the double-click test, which is built to quantify switch chatter.
• Test tracking by drawing slow circles into every corner — a dead zone or a jump is far easier to see in a continuous motion than in short flicks.
• On a phone, add fingers one at a time and watch Peak Touches to learn your screen's real multi-touch ceiling.

Troubleshooting

Related documentation

• KeyboardKeyboard Double-Click TestApplies a millisecond threshold to press-to-press timing and calls out chatter.
• MobileTouch Screen TestSix touch modes — quick draw, accuracy targets, multi-touch, a 25-cell grid, tracking and edge coverage — with a full pointer event log.
• KeyboardKeyboard Polling Rate TestMeasures the auto-repeat rate in Hz while you hold a key, with jitter and consistency.
• KeyboardJitter Clicking TestMeasures jitter-click CPS and, unusually, how even your rhythm is while you do it.