[Problem/Bug]: Calling devtools protocol method "Emulation.setDefaultBackgroundColorOverride" throws exception.

[WarWithinMe]

What happened?

Try to call devtools protocol Emulation.setDefaultBackgroundColorOverride, but failed with the following exception:

System.ArgumentException: Value does not fall within the expected range.
   at Microsoft.Web.WebView2.Core.Raw.ICoreWebView2.CallDevToolsProtocolMethod(String methodName, String parametersAsJson, ICoreWebView2CallDevToolsProtocolMethodCompletedHandler handler)
   at Microsoft.Web.WebView2.Core.CoreWebView2.CallDevToolsProtocolMethodAsync(String methodName, String parametersAsJson)

The code:

var param = "{\"color\": { r: 0, g: 0, b: 0, a: 0 }}";
await CoreWebView2.CallDevToolsProtocolMethodAsync("Emulation.setDefaultBackgroundColorOverride", param);

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Prerelease (Edge Canary/Dev/Beta)

Runtime Version

118.0.2088.76

SDK Version

1.0.2164-prerelease

Framework

Win32

Operating System

Windows 11

OS Version

No response

Repro steps

1. Create a sample project.
2. In project, create and display a CoreWebView2.
3. Call the devtools protocol as following:

var param = "{\"color\": { r: 0, g: 0, b: 0, a: 0 }}";
await CoreWebView2.CallDevToolsProtocolMethodAsync("Emulation.setDefaultBackgroundColorOverride", param);

Regression

No, this never worked

Last working version (if regression)

No response

[monica-ch]

@WarWithinMe Let me know if below code works.

var param =  "{\"color\": {\"r\": 0, \"g\": 0, \"b\": 0, \"a\": 0}}";
await CoreWebView2.CallDevToolsProtocolMethodAsync("Emulation.setDefaultBackgroundColorOverride", param);

[WarWithinMe]

@WarWithinMe Let me know if below code works.

var param =  "{\"color\": {\"r\": 0, \"g\": 0, \"b\": 0, \"a\": 0}}";
await CoreWebView2.CallDevToolsProtocolMethodAsync("Emulation.setDefaultBackgroundColorOverride", param);

It works, thanks for your solution