[Problem/Bug]: Why is the title displayed here?

[Krcuci]

What happened?

When using WebView2, if I set a transparent background for both WebView2 and the webpage, an unknown status bar appears at the top of the window. It displays the current page’s title, and if no title is set, it shows the current URL. This bar does not appear when the application first starts, but it shows up after I click on the WebView2 page. When I resize the window, it disappears again.
It seems that this URL status bar is always present, but it is normally hidden by the background. When a transparent background is set, it becomes visible.

Importance

Important. My app's user experience is significantly compromised.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

No response

SDK Version

No response

Framework

Win32

Operating System

Windows 10

OS Version

19044.3086

Repro steps

1. download project：https://github.com/MicrosoftEdge/WebView2Samples/tree/main/GettingStartedGuides/Win32_GettingStarted
2. set a transparent background：

// line 124
Microsoft::WRL::ComPtr<ICoreWebView2Controller2> controller2;
HRESULT col2hr = webviewController->QueryInterface(IID_PPV_ARGS(&controller2));
if (SUCCEEDED(col2hr) && controller2) {
	COREWEBVIEW2_COLOR transparentColor = { 0, 0, 0, 0 };
	controller2->put_DefaultBackgroundColor(transparentColor);
}

3. navigate a transparent background url.
4. click webview2(html) page.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response

[mikeduglas]

Same here today, yesterday everything was fine. Installed version 144.0.3719.82. WinForms.

[Krcuci]

Same here today, yesterday everything was fine. Installed version 144.0.3719.82. WinForms.

What should I do?

[wangyun-yunyitech]

Same here today, yesterday everything was fine

[wangyun-yunyitech]

I encountered the same problem.

[Krcuci]

I think it was Microsoft that accidentally pushed their debug code😅

[chevellabv]

Same here since today.

[TotoCodeFR]

duplicate #5492

[castorix]

It does not appear for me if i use WS_EX_NOREDIRECTIONBITMAP extended style for transparency.

HWND hWnd = CreateWindowEx(WS_EX_NOREDIRECTIONBITMAP,

[Krcuci]

It does not appear for me if i use WS_EX_NOREDIRECTIONBITMAP extended style for transparency.

HWND hWnd = CreateWindowEx(WS_EX_NOREDIRECTIONBITMAP,

yes!!! you are right, thanks :)

[wangyun-yunyitech]

It does not appear for me if i use WS_EX_NOREDIRECTIONBITMAP extended style for transparency.

HWND hWnd = CreateWindowEx(WS_EX_NOREDIRECTIONBITMAP,

Hello,Hello, how do I use it in WPF?

[wangyun-yunyitech]

https://developer.microsoft.com/zh-cn/microsoft-edge/webview2/?cs=3457492030&form=MA13LH#download

First, download the bug-free version 143. After extracting the CAB file, place it in the project's runtime directory. Manually set the runtime directory. (Temporary solution)

var WebViewPath = System.IO.Path.Combine(
System.AppDomain.CurrentDomain.BaseDirectory,
@"Assets\WebView2Version143"
);

 Environment.SetEnvironmentVariable(
   "WEBVIEW2_BROWSER_EXECUTABLE_FOLDER", WebViewPath,
   EnvironmentVariableTarget.Process
);

[castorix]

It does not appear for me if i use WS_EX_NOREDIRECTIONBITMAP extended style for transparency.
HWND hWnd = CreateWindowEx(WS_EX_NOREDIRECTIONBITMAP,

Hello,Hello, how do I use it in WPF?

It can be done with custom Startup (instead of StartupUri) and HwndSourceParameters to load a Page with WebView2 control, but there must be only this control in the Page (other controls won't be rendered...)