[tbb-bugs] #19037 [Applications/Tor Browser]: Suppress content access to page visibility API
Tor Bug Tracker & Wiki
blackhole at torproject.org
Wed May 11 22:40:09 UTC 2016
#19037: Suppress content access to page visibility API
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Reporter: arthuredelstein | Owner: tbb-
Type: defect | team
Priority: Medium | Status: new
Component: Applications/Tor Browser | Milestone:
Severity: Normal | Version:
Keywords: tbb-linkability, | Resolution:
TorBrowserTeam201605 | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Description changed by arthuredelstein:
Old description:
> The `document.visibility` property and the `visibilitychange` event let
> content know if the user has selected or deselected a tab. If the user
> switches from tab A to tab B, then tab A can observe a "hidden" event at
> the same time that tab B receives a "visibile" event. So it seems
> potentially useful to suppress this information.
>
> See https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
New description:
The `document.visibility` property and the `visibilitychange` event let
content know if the user has selected or deselected a tab. If the user
switches from tab A to tab B, then tab A can receive a "hidden" event at
the same time that tab B receives a "visible" event. So it seems
potentially useful to suppress this information.
See https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19037#comment:1>
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