I've asked this question on RE.SE and got a negative response: 4 downvotes and a note from Anton Kockkov:
This is a question for IT Security site, not for Reverse Engineering.
I see how this is on topic on IT Security, but I do not see how this is off topic here. The Reverse Engineering SE is for ...
researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
So the faq says.
In this particular question, I am a developer or researcher of a system, more specific a website. I explore the principles of that system, the website, by finding out on what CMS it's based. This has to be done through analysis of its structure (the HTML and CSS code) and perhaps on some functions of the website. And exactly with that, the analysis, I need help, because I don't know how to perform the analysis.
So why exactly is this off topic?