How do I test mouse buttons?

Click in the canvas. Left, middle, right, and extra buttons light when the browser reports mousedown. Right-click is captured so the context menu does not hide the event.

Does the trail measure DPI?

No. It shows movement in CSS pixels inside the canvas. DPI and polling rate belong to the driver.

HOTPLUG

Test the hardware in front of you

Channel G · Pointer 2

Mouse test

Move in the canvas for a trail. Click to light buttons. Scroll to see wheel delta. The page swallows context menu on the pad so right-click is visible.

Surface

Left

Middle

Right

Btn 3+

—Position

—Delta

—Scroll

—Buttons

What the OS reports

Button 0 is primary, 1 is wheel-click, 2 is secondary. Some mice send 3 and 4 for side buttons; whether they arrive depends on the browser and the OS. If a side button does nothing here, try it in the game or app you care about — the web platform is not the full HID stack.

FAQ

Trail looks jagged?

The browser samples mousemove, not the device’s native polling rate. Jagged lines at high speed are expected.