Maybe “commonly unexpected behavior” - or something? “Unexpected behavior of certain elements and their quirks”
RE: building blocks page — I could see that here:
and then the page it leads to - could have an ID for each section… - and maybe a little note in the copy of the element’s detail page could lead to that anchor on the gotcha page.
You could have a dedicated detail page for each gotcha - but I think that a little section would probably do the trick.
Let me know what else I can do to help / or what would be the next most useful step.
: )