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<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request Transparency support (best-effort) > Not every window can be made transparent. Transparency is applied on a best-effort basis and depends on how the target app/window is built and rendered. ## When it may not work * Windows with special rendering pipelines (e.g., certain hardware-accelerated / compositor-managed surfaces). * Some tool/popup/owned windows where the foreground window isn’t the actual surface being drawn. ## How it works (high-level) * Resolve the best target window (preferring the top-level/root window over transient children). * Apply Windows’ standard layered-window alpha mechanism (per-window opacity) to adjust transparency. * When unpinned, Restore the original opacity/state when possible. If transparency doesn’t change, it means the window doesn’t support this mechanism in its current configuration. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [X] Closes: #43278 #42929 #28773 <!-- - [ ] Closes: #yyy (add separate lines for additional resolved issues) --> - [ ] **Communication:** I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected - [ ] **Tests:** Added/updated and all pass - [ ] **Localization:** All end-user-facing strings can be localized - [ ] **Dev docs:** Added/updated - [ ] **New binaries:** Added on the required places - [ ] [JSON for signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json) for new binaries - [ ] [WXS for installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs) for new binaries and localization folder - [ ] [YML for CI pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml) for new test projects - [ ] [YML for signed pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml) - [ ] **Documentation updated:** If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys) and link it here: #xxx <!-- Provide a more detailed description of the PR, other things fixed, or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed https://github.com/user-attachments/assets/c97a87f2-3126-4e19-990f-8c684dbeb631 <img width="1119" height="426" alt="image" src="https://github.com/user-attachments/assets/547671ee-81d3-4c94-8199-bf0c4b1b7760" /> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>