8.83.3 Can you answer these questions?

8.83.3.1 biblatex: citefield + url + href (TeX capacity exceeded, sorry [input stack size=10000].)

https://tex.stackexchange.com/landing/r/digest?cta=question&id=669303

Is there a "off-the-shelf" way to use the url of a bibliography entry in the \href{} 
command using the \citefield{}{} command, for example \href{\citefield{ctan}{url}}{link}? 
The MWE below ... 
[biblatex] [urls]
 

asked by Dr. Manuel Kuehner https://tex.stackexchange.com/landing/r/digest?cta=user&id=14649 Score of 2

8.83.3.2 Context: how configure style of fields

https://tex.stackexchange.com/landing/r/digest?cta=question&id=669045

I am learning how to use pdf's field with Context. 
Here the code: 
%\usesymbols [fontawesome] 
\setuppagenumbering[location=] 
\setupinteraction   [state=start] 
%\setupbodyfont[utopia,10pt] 
\... 
[context] [textfield]
                                                                                  

                                                                                  
 

asked by voyager https://tex.stackexchange.com/landing/r/digest?cta=user&id=286730 Score of 1

answered by Max Chernoff https://tex.stackexchange.com/landing/r/digest?cta=user&id=270600 Score of 0

8.83.3.3 Papersize: page as long as document

https://tex.stackexchange.com/landing/r/digest?cta=question&id=669262

Is it possible to have a document in which the paper size expands as long as the document goes and only breaks to the next page on \newpage or similar command? 
Example of usage 
A simple example of ... 
[geometry] [paper-size] [layout]
 

asked by DJ9 https://tex.stackexchange.com/landing/r/digest?cta=user&id=241136 Score of 1