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CEFSharp can be used for implementing HTTP Basic authentication by using the IRequestHandler interface to intercept and handle authentication requests.

Here's an example of how to implement HTTP Basic authentication using CEFSharp:

1. Create a class that implements the IRequestHandler interface:

public class CustomRequestHandler : IRequestHandler
{
    public bool OnAuthRequired(IWebBrowser browserControl, IBrowser browser, IFrame frame, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)
    {
        if (scheme == "basic")
        {
            // Ask the user for credentials
            string username = "user";
            string password = "password";

            // Call the callback with the user's credentials
            callback.Continue(username, password);

            return true;
        }

        return false;
    }

    // Implement other IRequestHandler methods as needed
}

1. Set the CustomRequestHandler as the RequestHandler for your CEFSharp browser:

var settings = new CefSettings();
Cef.Initialize(settings);

var browser = new ChromiumWebBrowser();
browser.RequestHandler = new CustomRequestHandler();

// Use the browser as usual

1. When an HTTP Basic authentication request is encountered, the OnAuthRequired method will be called. In this method, you can prompt the user for their credentials and call the callback.Continue method with the user's credentials. This will authenticate the user and allow the request to proceed.

Note that this example prompts the user for their credentials in code, but in a real application, you would want to provide a more user-friendly way of entering their credentials. Additionally, you may want to store the user's credentials securely and reuse them for subsequent requests.