[tor-bugs] #14429 [Tor Browser]: Automated rounding of content window dimensions

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#14429: Automated rounding of content window dimensions
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     Reporter:           |      Owner:  arthuredelstein
  arthuredelstein        |     Status:  needs_revision
         Type:  defect   |  Milestone:
     Priority:  normal   |    Version:
    Component:  Tor      |   Keywords:  tbb-fingerprinting-resolution, tbb-
  Browser                |  torbutton
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by bernie.allen):

 Replying to [comment:98 arthuredelstein]:
 > What is the zoom level?

 119%

 > The reason for zooming is that, if we don't zoom at all, then there will
 be a large grey margin at the bottom. Zooming out in this case be nicer,
 but it's impossible to get precise multiples of 100 when we zoom out.

 That makes sense.

 The zoom ratio is potentially higher for lower display resolutions because
 100 pixels is a greater proportion of the total height.  In my case I
 think I am just short of the next 100 pixel cutoff when maximized, which
 causes a large zoom.  So I reconfigured the Tor Browser UI to give more
 vertical space, and now maximizing only causes a 101% zoom, which looks
 great.

 1024x600 is probably an unusually low resolution, and reconfiguring the UI
 is a fine solution to me.  Two other possible solutions though:
 1. Zoom out instead of in when you are close to the next multiple.  For
 instance, if you are at 499 pixels you only need the tiniest zoom out to
 make it to 500.  But you need a large zoom in to remove a 99-pixel border.
 I think the zoom out should be small enough that it does not cause an
 accessibility problem.
 2. Make the quantization interval smaller for smaller sizes (e.g., 50
 pixels), so the maximum zoom is less.  But I understand there is already
 concern that 100 pixels adds too much entropy.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14429#comment:99>
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