[Bug - Partner Center] Edge browser: Alerts/prompts not displaying in full screen, macOS

[grilledbanana]

Using fullscreen programmatically in the Edge window through the service worker, causes alerts/prompts to not be visible on the page but still under the hood they stop the execution of javascript. Reproducible on macOS and Edge browser

To Reproduce
Steps to reproduce the behavior:

1. Inspect the page using right click > inspect.
2. Open the service worker (background script) of some extension.
3. Paste these two lines into service worker to make window's state fullscreen using Chrome API:
4. win = await chrome.windows.getCurrent()
5. await chrome.windows.update(win.id, {state: "fullscreen"})
6. Go back to the page inspect element devtools.
7. Enter alert("test") in there
8. No alert is shown on the page. It's somewhere in the process and JS execution is blocked, you have to get window out of fullscreen in order for alert to appear. Until then => page is blocked in fullscreen state.

Expected behavior
Alert is displayed on the page when it is in programmatically forced full screen on macOS device

Desktop (please complete the following information):

• OS: macOS Tahoe 26.4, and 26.4.1
• Browser: Microsoft Edge
• Version: Version 147.0.3912.86 (Official build) (arm64)

[Rahul-Bauri]

Hi @grilledbanana Thanks for reporting the issue. I’ll have the engineering team investigate and will update you once I have any updates to share or if additional details are needed to help resolve the issue.

In the meantime, could you please provide a video recording of the issue, it will help us to investigate the issue better.

[carlosjeurissen]

@Rahul-Bauri See demo extension:
https://jeurissen.co/webext-demos/alert-fullscreen