KenK wrote:

Site put a big promo window repeatedly on my printout, though it
didn't show on the Firefox display or the Print Preview display.
Here's the site

https://draxe.com/effective-all-natu...for-arthritis/

II don't know whether it will do the same to your printout as it did
to me.

In any event, is there a way to tell on a site if this is going to
happen without wasting a bunch of paper and ink?

In Google Chrome 63.0.3239.132 (and later updating to 64.0.3282.119) x64
desktop, no navbar banner appears in the preview when I select to print
the page. When I "print" to a .pdf file, there is no navbar banner in
the output.

In Firefox 58.0 x64 desktop, its Print preview show no navbar banner at
the top. When I "print" to a .pdf file, there is no navbar banner in
the output. I was going to suggest using Firefox's Reader View (since
its icon appears at the right side of the address bar when visiting that
page); however, the code in Firefox reports "Failed to load article from
page". So the code recognizes that it could reduce the content of the
page but the server refuses to deliver a reduced content copy of the
page.

I use the Bullzip PDF Printer program to give me an emulated printer
definition that outputs to .pdf files from any program that provides a
print function. There are LOTS of similar PDF printer tools:
PDFCreator, SumatraPDF, CutePDF, Foxit PDF, etc. I'd stay away from
NitroPDF as it was a pig on its disk and memory footprints (but it's
been a couple years since I last trialed it). Printing to a PDF file
eliminates wasting any ink and paper until you decide to print to a real
printer (either from within the web browser by picking a real printer or
by using the Print function inside whatever PDF reader you use).

A few years ago, both my HP and Canon printers had drivers that
installed ancilliary "preview" software. When a document got printed to
those printers, there was a config option to show a preview of the
document as it would get printed. Those printers got replaced with an
HP all-in-one printer. Alas, HP took away the preview option back
several versions in their drivers. I could go back to the old driver
that had the preview option but I would lose other functions. So I
decided to print to PDF to preview before committing to hardcopy.
GreenPrint (https://www.printgreener.com/) gives back what the printer
makers took away for a preview before print (*not* the preview shown by
programs which may not be accurate); however, GreenPrint costs $19
versus the multitude of PDF printer programs that are free, plus
GreenPrint works as a PDF printer itself so it makes no sense to pay for
it when the alternatives are free.

Note that use both uBlock Origin (with several DNSBLs selected but not
all) and uMatrix (to block, by default, off-domain scripts only, not
other content types from off-domain sources). So those might be
altering what Print gets to process although the navbar banner is
displayed when viewing the rendered page.

If the navbar banner had appeared in the output, I would call the Print
Edit WE extension (in either Google Chrome or Firefox) to select
elements of the page that I want to delete and then print the result.
While Print Edit lets you take away content from a page before printing
it, the Nimbus Screen Capture extension (also available in both Google
Chrome and Firefox) lets you decide what part of a page to capture and
then what to do with that captured portion.