[rnotaro]

You can use Chrome Remote Debugging to access the developer console for a mobile device.

https://developers.google.com/web/tools/chrome-devtools/remo...

You can also load Eruda with Javascript. https://github.com/liriliri/eruda

[yorwba]

The problem with remote debugging is that it apparently requires a separate device, whereas I was thinking about people who only have a smart phone. That's what I meant by "Maybe it would be possible to connect to the remote debugger with an on-device client?"

The Eruda approach to inject the debug console with a oneliner in the address bar seems like a possible solution, though. Thanks.