[tbb-bugs] #29564 [Applications/Tor Browser]: DOMRect on at least Linux is not consistent

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#29564: DOMRect on at least Linux is not consistent
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 Reporter:  Thorin              |          Owner:  tbb-team
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Component:  Applications/Tor Browser
  Version:                      |       Severity:  Normal
 Keywords:  tbb-                |  Actual Points:
  fingerprinting-os             |
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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 Test site:
 https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#domrect

 Note: this is the same code as used by [2] which is **based on** [3]

 [2] https://canvasblocker.kkapsner.de/test/domRectTest.html
 [3] https://browserleaks.com/rects

 I expect differences between OS (Windows vs Linux vs macOS etc), but not
 between platforms (Ubuntu vs Debian). My test suite is not definitive,
 **so there may be others**: results

 Win7/10:
 `2380796ca1fab68e105199501407219d670114c99e0cee1cf176e03a04bad769`
 ^^ good

 Mint, Ubuntu, openSUSE
 `8607449084c2811952029f052ef158346f4c850795376e3de41ed3ea229add6b`
 ^^ good

 Debian
 `bb24643dfd4856c875a2b8dd877b5ec76626c2d88b77c963e20c8f788823e420`
 ^^ **not good**

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29564>
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