Intent to Extend Experiment: Capture all screens
Simon Hangl
Hello blink-dev,
We’d like to ask for an extension to our Origin Trial, from M124 to M130. This is due to the dependency on isolated web apps.
Contact emails
Explainer
https://github.com/screen-share/capture-all-screens/blob/main/README.md
Specification
https://screen-share.github.io/capture-all-screens
Design docs
https://screen-share.github.io/capture-all-screens
https://github.com/screen-share/capture-all-screens/blob/main/README.md
Summary
Capture all the screens currently connected to the device using getAllScreensMedia(). Calling getDisplayMedia() multiple times requires multiple user gestures, burdens the user with choosing the next screen each time, and does not guarantee to the app that all the screens were selected. getAllScreensMedia() improves on all of these fronts. (As this feature has extreme privacy ramifications, it is only exposed behind an enterprise policy, and users are warned before recording even starts, that recording *could* start at some point.)
Blink component
TAG review
https://github.com/w3ctag/design-reviews/issues/856
TAG review status
Complete
Chromium Trial Name
GetAllScreensMedia
Link to origin trial feedback summary
https://github.com/screen-share/capture-all-screens/issues
Origin Trial documentation link
https://github.com/screen-share/capture-all-screens
Risks
Interoperability and Compatibility
This API is only available to origins allowlisted by administrators through a policy. The policy itself is non-standard, limiting even theoretical interoperability.This API rejects requests from pages that are not allow-listed through an administrator. The likelihood of this API being adopted by a browser that does not provide administrators mechanisms to manage clients is low.
Gecko: N/A
WebKit: N/A
Web developers: Positive (https://github.com/screen-share/capture-all-screens/issues/9)
Other signals:
Ergonomics
No
Activation
The challenge for developers is the limitation of the API to origins allowlisted by an enterprise policy.
Security
1. Risk of malicious sites exploiting the API and gaining access to sensitive information on users' devices. This risk is mitigated by the API only being accessible to origins allowlisted by an enterprise policy.
2. Risk of users loading private information that gets recorded and made available to apps affiliated with their device's admin. This risk is mitigated by informing users that recording might start at any moment before the API becomes accessible. (In CrOS, this warning is delivered in the log-in screen, and when users log-in despite the warning, this is tantamount to assent.)
3. Risk of users forgetting that their screens are being recorded. This risk is mitigated through a persistent notification.
Goals for experimentation
Learn about the experience of web developers and how this API fulfills their needs.
Reason this experiment is being extended
This API will eventually be released for isolated contexts, which are delayed. Hence, we are asking for an extension of the origin trial.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
No
This API is initially implemented on CrOS, where demand for it is greatest, and where we have the most flexibility in offering users early warning that their screens may be recorded if they proceed past the log-in screen. Lessons learned from shipping this API on CrOS will be used when deciding how to correctly implement such warnings on other platforms.
Is this feature fully tested by web-platform-tests?
No, as WPTs don’t support setting of managed policies. The API is tested by a number of unit- and browser- tests (Test files).
DevTrial instructions
https://github.com/screen-share/capture-all-screens/blob/main/HOWTO.md
Flag name on chrome://flags
enable-get-all-screens-media
Finch feature name
None
Non-finch justification
None
Requires code in //chrome?
True
Tracking bug
https://issues.chromium.org/issues/40216442
Launch bug
https://launch.corp.google.com/launch/4201060
Estimated milestones
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6284029979525120
Links to previous Intent discussions
Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAEdDZo9N354i6eST0x19TXwpeBtgs5_gJUYVF%2BTKLpiJySDADg%40mail.gmail.com
Intent to Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/6TRT0XsVOE4/m/NOm-YEQCAgAJ
Simon Hangl
Software Engineer
Google Germany GmbH
Erika-Mann-Straße 33
80636 München
Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
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Yoav Weiss (@Shopify)
Hello blink-dev,
We’d like to ask for an extension to our Origin Trial, from M124 to M130. This is due to the dependency on isolated web apps.
Contact emails
Explainer
https://github.com/screen-share/capture-all-screens/blob/main/README.md
Specification
https://screen-share.github.io/capture-all-screens
Design docs
https://screen-share.github.io/capture-all-screens
https://github.com/screen-share/capture-all-screens/blob/main/README.md
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Vladimir Levin
Hello blink-dev,
We’d like to ask for an extension to our Origin Trial, from M124 to M130. This is due to a dependency on isolated web apps, which are delayed.
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