mouse pointer events test
This page captures PointerEvent data from your mouse, pen or touchpad in real time and shows pointerType, the pressed button, pressure and coordinates on every movement. Position, button state and pressure are read and discarded only inside your browser, with no data ever sent to an external server.
button shows 0 because it is the primary button reported in isolation at the instant of the click, and buttons confirms it with bit 1 set, the same information seen from two angles.
The sum of 1 plus 2 equal to 3 in buttons shows both buttons pressed at once, a state button alone, limited to one value at a time, cannot express.
Without those batched events a drawing tool would lose every point between one frame and the next, and the line would come out with corners instead of a smooth curve.
It shows the common buttons exposed by Pointer Events: left, right, middle (the wheel), and the two side back/forward buttons, when the mouse and driver report them.
button is a single number describing which button triggered that specific event, useful right at the moment of the click; buttons is a bitmask that adds up every button currently pressed, so it is what tells you about combinations, like the left and right buttons held down together.
Not directly: PointerEvent delivers coordinates in CSS pixels on screen, already converted by the driver and the operating system, so this page shows position, button and pressure, but it cannot isolate the raw counts per inch coming from the physical sensor.
Because most mice have no physical pressure sensor, so the browser fills pressure with 0.5 while a button is held down and 0 when no button is pressed, a fixed default rather than an actual force measurement.
Because the hardware may sample at 500 Hz or 1000 Hz, but the screen typically repaints at around 60 Hz; the browser delivers one event per visible frame and keeps the extra points available through getCoalescedEvents(), which this page can also expose.
Events are processed locally and discarded when you leave the page.