Specification

https://w3c.github.io/window-management/

Explainer

https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md

Links

• The WG's request for this TAG review: https://lists.w3.org/Archives/Public/public-secondscreen/2026Jul/0001.html
• An introduction to the feature, aimed at unfamiliar audiences: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#introduction
• A description of the problems that end-users were facing before this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#problem-and-use-cases
• Alternatives considered: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#alternatives-considered
• Examples of how to use the proposal to solve the end-users' problems: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#proposal
• What do the end-users experience with this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#proposal
• Web Platform Tests:
  • https://wpt.fyi/results/css/mediaqueries/display-state.tentative.html?label=master&label=experimental&aligned
  • https://wpt.fyi/results/css/mediaqueries/resizable.tentative.html?label=master&label=experimental&aligned
  • https://wpt.fyi/results/window-management/additional-windowing-controls.tentative.https.html?label=experimental&label=master&aligned

The specification

• Follows the Web Platform Design Principles.
• Includes Security and Privacy Considerations sections based on answers to the Security/Privacy Questionnaire.

Where and by whom is the work is being done?

• GitHub repo: https://github.com/patrykchodur/window-management
• Primary contacts:
  • Patryk Chodur (@patrykchodur), Google, Editor
  • Mike Wasserman (@michaelwasserman), Google, Editor
• Organization/project driving the specification: Google Chrome team
• This work is being funded by: Google
• Primary standards group developing this feature: Second Screen Working Group
• Incubation and standards groups that have discussed the design:
  • CSS WG - window.onmove event proposal that was removed from the specification - https://github.com/w3c/csswg-drafts/issues/7693#issuecomment-2842594228
  • Second Screen WG - https://github.com/w3c/window-management/issues/158

Feedback so far

• Active horizontal reviews:
• Multi-stakeholder feedback:
  • Chromium comments:
  • Mozilla comments:
  • WebKit comments:
• Major unresolved issues with or opposition to this specification:
• Status/issue trackers for implementations:
  • https://chromestatus.com/feature/5201832664629248

You should also know that...

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