How to use GetExecutablePathAsync method of PuppeteerSharp.Launcher class

Change your Window_Loaded event method to async and do an await on the Init method, Event Handler methods are an exception. using async void instead of async Task is ok in this scenario. - Reference (Should I avoid 'async void' event handlers?):

private async void Window_Loaded(object sender, RoutedEventArgs e) 
{  
   await Handler.Init(Handler);
}

You can use the selectors #login-form-username and #login-form-password, those are the IDs.

For local path, need to use file protocol like below:

await page.GoToAsync("file://" + Path.Combine(context.FunctionAppDirectory, "www", "index.html"));

Just replacing navigation with WaitUntilNavigation.Networkidle2 worked to wait until Javascript is finished to excute.

using PuppeteerSharp;

await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
Browser browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
    Headless = true // false if you need to see the browser
});
var page = await browser.NewPageAsync();
page.DefaultTimeout = 5000; // or you can set this as 0
await page.GoToAsync("https://www.google.com", WaitUntilNavigation.Networkidle2);
var content = await page.GetContentAsync();

Console.WriteLine(content);

I have found the solution, here it is for those who may be interested:

First, we should create a CDPSession like this:

var client = await page.Target.CreateCDPSessionAsync();

then we should Evaluate our script to get an element:

var body = await client.SendAsync("Runtime.evaluate", new { expression = "document.getElementsByTagName('input')[0]" });

and at last, we should use DOMDebugger with the element's objectId to get its event listeners:

var result = await client.SendAsync("DOMDebugger.getEventListeners", new { objectId = body["result"]["objectId"] });

The content you trying to scrape here is inside iframe.
To access it you have to switch to that iframe.
See here example how to switch to iframe with BeautifulSoup.
Here example with Selenium scraping inside iframe.
And here with puppeteersharp

Adding the stealth plugin to puppeteer-sharp may not be as simple than on the NodeJS Version. A C# port of the puppeteer-extra which works with puppeteersharp exists. Check https://github.com/Overmiind/Puppeteer-sharp-extra.

You shouldn't turn those flags on unless you get stuck :)

• EnqueueAsyncMessages was created for cases where your code is not async all the way. I honestly dislike that flag.
• EnqueueTransportMessages is recommended on .NET Framework code because the websocket library behaves differently there.

Regarding ResourceTypes, ResourceType.Image comes from Chrome and ResourceType.Img comes from Firefox.

When I used querySelectorAll. My issue has been resolved.

var  content = await page.EvaluateExpressionAsync("document.querySelectorAll('#res')");