[tor-bugs] #8455 [Firefox Patch Issues]: Test font exempt font fallback rendering behavior

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue Mar 12 17:41:41 UTC 2013


#8455: Test font exempt font fallback rendering behavior
----------------------------------+-----------------------------------------
 Reporter:  mikeperry             |          Owner:  mikeperry
     Type:  project               |         Status:  new      
 Priority:  major                 |      Milestone:           
Component:  Firefox Patch Issues  |        Version:           
 Keywords:  tbb-fingerprinting    |         Parent:           
   Points:                        |   Actualpoints:           
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 Gk pointed out in
 https://trac.torproject.org/projects/tor/ticket/5273#comment:42 that the
 initial display font before the WebFont is loaded is the "best fallback
 CSS font on the user's computer" (from https://developer.mozilla.org/en-
 US/docs/CSS/@font-face).

 My guess was that the chosen font will be the default system font for the
 specified style if we don't have that font family, but what if the WebFont
 has the same name as a font that is on the system? Do we exempt it and
 allow text to be rendered with that local font briefly? Or does Firefox
 decide not to download the WebFont in the first place, such that that rule
 will count as a font probe?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8455>
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