How to run default success Web Form submit page?

Is it possible to call the default javascript function for a successful submit button event in a Web Form? I’ve tried looking for it in the console, but no luck so far.

I have a in the js file which inserts data through a whitelisted function. I find the default success page very clean and sufficient for use. So, I looked into the console to get a hint of the function call so I can call it in the callback: parameter, but without luck so far.