[css3-page] Recommendation for page-size with UA interaction

 From an internal chat I had with Simon:

On 3/26/13 9:28 AM, Simon Sapin wrote:
>> Julian Viereck wrote:
>>
>> We are talking here only about print-header/footer but similar things
>> apply for page-size. E.g. in Gecko/Firefox, the user can change the
>> page-size from the print-preview menu e.g. on Linux. There should be a
>> recommendation what todo if the website developer specifies a page-size
>> (e.g. disable page-size selection in the UA).
>
> That’s a good point, I hadn’t thought about it. Bring it up on 
> www-style (maybe a new thread.) It’s a bit more complex since the size 
> of the page box might not be the same as the size of the page (paper) 
> sheet.
>
> http://dev.w3.org/csswg/css3-page/#renderingpages
> http://dev.w3.org/csswg/css3-page/#positioning-page-box 

- Julian