@jelv:
Many thanks for the detailed explaination, much appreciated.
@b*cat:
Does that help you understand the technique?
Afraid not, I am familiar with and use the "insert quote" facility to copy a complete post for insertion into an answer and I can certainly see the narative of the embedded URL produced, however still doesn't help with achieving "jelv's" example of "graphic less" hyperlinks.
Thank you for taking the trouble to respond, appreciated, as "jelv's" explanation is very clear and detailed, even I can now understand, I think the penny has finally dropped!