I do not have an Android IDE installed (nor one for iOS) - and would prefer not to have to install one and perform remote debugging.
How can I do that on an Android tablet (or, later, iOS)? I prefer a purely browser based solution, but could accept an Android/iOS based app.
For Android you can use remote debugging through chrome as described here
I'll summarize/rewrite the steps (for browser based debugging) here in case the link ever goes down.
chrome://inspect/#deviceson your desktop Chrome browser. (Alternatively, to get to the same screen, you can select
Chrome menu > Tools > Inspect Devices)
If for some reason you have an older version of chrome and cannot upgrade. There is a plugin that you can install to accomplish the same thing.