sybok
1) Can I see a preview of the X content?
A) Ahem, do you mean you hover over the link and a “floating” preview is generated?
I have not seen that but it might be because of the add-ons and ‘/etc/hosts’ I use.
B) Could you post a screenshot of a working preview for reference?
C) I suggest you examine the source of the web-page that displays the preview and compare it to this link.
Perhaps, there’s some magic not activated in the way the link is incorporated to the web-page, selection of cookies etc.
BTW, I recently discovered the following simple web-page advocating simple non-bloated design – https://justfuckingusehtml.com/