[tbb-bugs] #22137 [Applications/Tor Browser]: Provide the same scrollbar size across different platforms

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#22137: Provide the same scrollbar size across different platforms
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 Reporter:  gk                             |          Owner:  tbb-team
     Type:  defect                         |         Status:  new
 Priority:  High                           |      Milestone:
Component:  Applications/Tor Browser       |        Version:
 Severity:  Normal                         |     Resolution:
 Keywords:  tbb-fingerprinting-resolution  |  Actual Points:
Parent ID:  #18283                         |         Points:
 Reviewer:                                 |        Sponsor:
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Comment (by Thorin):

 > FYI: There will also be a test for this at
 https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#useragent
 - under `[scrollbar width] os` when added (soon), which incorporates
 detection of zoom (which is required to correctly calculate the scrollbar
 width if zoom is not 100%)

 Added it. I didn't bother to add the os logic yet, but have built
 detection of zoom (but not factored it to reverse the result - it's not
 very precise). Anyway, at least the test is there to return the width in
 tests. Zoom your page and refresh to see what I mean.

 Probably tomorrow I will add, if zoom is at 100%, an OS value as well
 (which isn't really the point, the actual width itself is the entropy)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22137#comment:12>
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