#23104: CSS line-height reveals the platform Tor Browser is running on --------------------------------------+-------------------------- Reporter: gk | Owner: igt0 Type: defect | Status: accepted Priority: Medium | Milestone: Component: Applications/Tor Browser | Version: Severity: Normal | Resolution: Keywords: tbb-fingerprinting-os | Actual Points: Parent ID: | Points: Reviewer: gk | Sponsor: --------------------------------------+-------------------------- Changes (by igt0):
* cc: igt0 (added) * reviewer: => gk Comment: Many fonts have issues with their vertical metrics. they are used to influence the height of ascenders and depth of descenders. Gecko uses it to calculate the line height (font height + ascender + descender), however because of that idiosyncratic behavior across multiple operating systems, it can be used to identify the user's OS. The solution proposed in the patch(see attached patch) is to use a default factor to be multiplied as ascender and descender. This way all operating systems will have the same line height. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23104#comment:3> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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