I've got a quite unusual question here.
Would asking a question about the Apple website directly be on-topic?
If so, what are the specifications or the "checklist" I should follow when asking a question about that?
We have plenty of well-received questions in the apple-store tag, including questions about the online store. There's even more questions linking to the Apple Developer Portal, so this definitely counts as an Apple products as mentioned in the tour. The usual caveat (What types of questions should I avoid asking?) applies, as it always does.