Mouse Cursor styling, like Col-Resize and Not-Allowed See Examples Here do not seem to apply to the mouse that appears on a phone or tablet through USB OTG. Any way to apply CSS, Javascript or other styles to the OTG mouse?
It is actually Android's kernel that doesn't support different mouse cursors. Even in the app IDE's it is impossible to change the cursor without drawing on top of it. People don't typically use mice on mobile devices for Internet browsing therefore that's why it is not implemented.
If you're absolutely looking for a solution, you will have to host your webpage inside an app container with a WebView and use Android's Javascript Communication Interface to detect the mouse hovers, and a System Overlay to draw on top the mouse cursor. It is a difficult implementation but it is the only solution for the specific situation. I can maybe help you out with the implementation if you request.
Happy developing,