This is an online tool to help troubleshoot issues.
Try out the tool here: 7P Tablet Tester
Can draw with pen, mouse, and touch (if your tablet supports touch)
Pen drawing features
Pressure affects size of brush
Tilt - Not yet implemented
Show current numeric values for position, pressure, tilt, etc. - Not yet implemented
Save canvas as PNG file
Clear canvas
Windows
Pen API:
Needs Windows Ink to be enabled in the tablet driver.
If using WinTab, no pressure is supported.
Chrome - WORKS
Firefox - WORKS
MacOS
Safari - yet to be tested
Chrome - WORKS
Linux
Chrome - WORKS
Firefox
Wayland - WORKS
X11 -
use env MOZ_USE_XINPUT2=1 firefox
to make it work
more info on what's going on with the X11 issue:
iPadOS
Safari - WORKS
Android
Chrome - WORKS