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Re: [tor-bugs] #26606 [Applications/Tor Browser]: investigate fingerprinting and linkability risks of the Intersection Observer API

#26606: investigate fingerprinting and linkability risks of the Intersection
Observer API
-------------------------------------------------+-------------------------
 Reporter:  mcs                                  |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting,tbb-              |  Actual Points:
  linkability,ff60-esr,TorBrowserTeam201807      |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Description changed by mcs:

Old description:

> ​Support the Intersection Observer API was added was added during the
> ESR60 development cycle. This API "provides a way to asynchronously
> observe changes in the intersection of a target element with an ancestor
> element or with a top-level document's viewport." and may add linkability
> or fingerprinting risks. See:
>  https://bugzilla.mozilla.org/show_bug.cgi?id=1321865
>  ​https://developer.mozilla.org/en-
> US/docs/Web/API/Intersection_Observer_API

New description:

 ​Support for the Intersection Observer API was added during the ESR60
 development cycle. This API "provides a way to asynchronously observe
 changes in the intersection of a target element with an ancestor element
 or with a top-level document's viewport." and may add linkability or
 fingerprinting risks. See:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1321865
  ​https://developer.mozilla.org/en-
 US/docs/Web/API/Intersection_Observer_API

--

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26606#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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