Draw with an active pen or graphics-tablet stylus and inspect exactly what the browser receives: normalized pressure, tilt, twist, contact size, pen buttons and observed sample cadence. Mouse and touch input are identified separately so they are not mistaken for stylus telemetry.
Pointer Events can report a fixed pressure value for non-pressure devices while a button is active. That is why this page shows pointer type prominently and does not treat a mouse's pressed-state value as genuine pen pressure sensitivity.
Many pen APIs expose pressure as a normalized 0–1 value rather than the raw digitizer measurement. A smooth changing range is useful evidence that pressure data reaches the browser, but the exact curve can be shaped by the driver, operating system and browser.
Not reaching exactly 0.000 or 1.000 does not automatically mean the pen is defective.
Tilt values indicate the pen's angle relative to the tablet surface where supported. Twist represents barrel rotation on devices that expose it. Button bitmasks can vary by pen, driver and operating system, so compare the value while pressing one control at a time.
The event-rate figure counts browser-delivered pen events over a rolling window. Coalesced Pointer Events may contain extra samples between dispatched events. Neither figure should be advertised as the tablet's certified hardware report rate.
The device may be reaching the browser as a mouse, the tablet driver may be missing or misconfigured, or the browser/OS path may not expose pressure. Confirm the Pointer Type readout first.
No. It can count distinct normalized values observed during your session, but that is not a reliable replacement for the hardware specification.
The pen, digitizer, driver or browser may not expose those properties. Missing telemetry does not by itself prove a hardware failure.
No. The canvas and pointer-event processing stay in this browser tab and are cleared when you leave or reset the page.