I often have to troubleshoot cross-browser and cross-platform CSS and HTML issues; I've asked some questions of this type on StackOveflow, but some of the questions I've asked there bore no fruit, even after a few months. Is this forum a good place for CSS and HTML troubleshooting related questions?
No, it is not In general, unless your programming question is about something like SEO, programming questions are off-topic. If you haven't gotten a response for your questions on stack overflow, I would use the bounty feature, or see if you can edit your question to make it more answerable. Also, take a look at this post: https://webmasters.meta.stackexchange.com/a/883/6901