[Bug]: Download notification popup appears blank (white) on Microsoft Edge v144+ when clicking download links

[t1-2026]

Version

Microsoft.Playwright 1.58.0 (.NET 10)

Steps to reproduce

1. Launch browser with Channel = "msedge" (Microsoft Edge v144 or later)
2. Navigate to a page that contains a download link
3. Click the download link using RunAndWaitForDownloadAsync

await using var browser = await playwright.Chromium.LaunchAsync(new()
{
    Channel = "msedge",
    Headless = false
});
var page = await browser.NewPageAsync();
await page.GotoAsync("https://example.com/download-page");

var download = await page.RunAndWaitForDownloadAsync(async () =>
{
    await page.ClickAsync("a[href*='download']");
});

### Expected behavior

The download notification popup that appears in the top-right corner of the Edge
browser window renders correctly, showing file name, file size, and action buttons.


### Actual behavior

The download notification popup that appears in the top-right corner of the Edge
browser window is completely blank (white/empty). No content is rendered inside
the popup.

<img width="1152" height="648" alt="Image" src="https://github.com/user-attachments/assets/967b864b-e9b1-4af9-b55a-09c490ebae4a" />

### Additional context

- This issue **started with Edge v144**. Confirmed working correctly on **Edge v143 and earlier**.
- The download itself **completes successfully**; only the UI popup is blank.
- No workaround has been identified yet.
- This issue does **not** reproduce with the bundled Chromium
  (i.e., without specifying `Channel`).

### Environment

```Text
- **OS:** Windows 11
- **Browser channel:** `msedge`
- **.NET Version:** .NET 10
- **Playwright .NET Version:** 1.58.0
- **Headless:** `false`

[dgozman]

@t1-2026 Sorry for the late reply. Could you please share the actual repro, with a page that has a download and fails to work? Unfortunately, we cannot fix issues without a repro.

[t1-2026]

Thank you for your response.

Here is a minimal reproduction case using a publicly accessible page:

Environment:

• Edge v144+ (confirmed working on v143 and earlier)
• Playwright .NET 1.58.0
• Headless: false

Repro code:

using var playwright = await Playwright.CreateAsync();
await using var browser = await playwright.Chromium.LaunchAsync(new()
{
    Channel = "msedge",
    Headless = false
});
var page = await browser.NewPageAsync();
await page.GotoAsync("https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_a_download");

var download = await page.RunAndWaitForDownloadAsync(async () =>
{
    await page.ClickAsync("a[download]");
});