Privacy/Features/Limit CSS3 resolution

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Status

Limit CSS3 resolution and window.screen info to render window size
Stage	Draft
Status	`
Release target	`
Health	OK
Status note	`

{{#set:Feature name=Limit CSS3 resolution and window.screen info to render window size

|Feature stage=Draft |Feature status=` |Feature version=` |Feature health=OK |Feature status note=` }}

Team

Product manager	Sid Stamm
Directly Responsible Individual	`
Lead engineer	`
Security lead	`
Privacy lead	`
Localization lead	`
Accessibility lead	`
QA lead	`
UX lead	`
Product marketing lead	`
Operations lead	`
Additional members	`

{{#set:Feature product manager=Sid Stamm

|Feature feature manager=` |Feature lead engineer=` |Feature security lead=` |Feature privacy lead=` |Feature localization lead=` |Feature accessibility lead=` |Feature qa lead=` |Feature ux lead=` |Feature product marketing lead=` |Feature operations lead=` |Feature additional members=` }}

Open issues/risks

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Stage 1: Definition

1. Feature overview

Several projects inlcuding the EFF's panoptclick and Tor (https://trac.torproject.org/projects/tor/ticket/2875) have notices that both desktop resolution can be used to fingerprint users.

There are two issues here: information leaked via Javascript and information leaked via CSS media queries.

2. Users & use cases

-Privacy Enhancing Addons such as the Tor button -web developes testing the behavior of their websites on different platforms

3. Dependencies

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4. Requirements

-CSS properties must not reveal browser side.

Non-goals

-No need to touch Javascript related functions/attributes as these can be handled by the capabilities code.

Stage 2: Design

5. Functional specification

Add a preference to to hide css device information (disabled by default)

When this preference is enabled CSS devuce queries should return the window values instead.

6. User experience design

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Stage 3: Planning

7. Implementation plan

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8. Reviews

Security review

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Privacy review

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Localization review

No Need?

Accessibility

`

Quality Assurance review

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Operations review

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Stage 4: Development

9. Implementation

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Stage 5: Release

10. Landing criteria

` {{#set:Feature open issues and risks=` |Feature overview=Several projects inlcuding the EFF's panoptclick and Tor (https://trac.torproject.org/projects/tor/ticket/2875) have notices that both desktop resolution can be used to fingerprint users.

There are two issues here: information leaked via Javascript and information leaked via CSS media queries. |Feature users and use cases=-Privacy Enhancing Addons such as the Tor button -web developes testing the behavior of their websites on different platforms |Feature dependencies=` |Feature requirements=-CSS properties must not reveal browser side. |Feature non-goals=-No need to touch Javascript related functions/attributes as these can be handled by the capabilities code. |Feature functional spec=Add a preference to to hide css device information (disabled by default)

When this preference is enabled CSS devuce queries should return the window values instead. |Feature ux design=` |Feature implementation plan=` |Feature security review=` |Feature privacy review=` |Feature localization review=No Need? |Feature accessibility review=` |Feature qa review=` |Feature operations review=` |Feature implementation notes=` |Feature landing criteria=` }}

Feature details

Priority	P1
Rank	999
Theme / Goal	Advancing Anonymity
Roadmap	Privacy
Secondary roadmap	`
Feature list	Platform
Project	`
Engineering team	`

{{#set:Feature priority=P1

|Feature rank=999 |Feature theme=Advancing Anonymity |Feature roadmap=Privacy |Feature secondary roadmap=` |Feature list=Platform |Feature project=` |Feature engineering team=` }}

Team status notes

	status	notes
Products	`	`
Engineering	`	`
Security	`	`
Privacy	`	`
Localization	`	`
Accessibility	`	`
Quality assurance	`	`
User experience	`	`
Product marketing	`	`
Operations	`	`

{{#set:Feature products status=`

|Feature products notes=` |Feature engineering status=` |Feature engineering notes=` |Feature security status=` |Feature security health=` |Feature security notes=` |Feature privacy status=` |Feature privacy notes=` |Feature localization status=` |Feature localization notes=` |Feature accessibility status=` |Feature accessibility notes=` |Feature qa status=` |Feature qa notes=` |Feature ux status=` |Feature ux notes=` |Feature product marketing status=` |Feature product marketing notes=` |Feature operations status=` |Feature operations notes=` }}