This document shows you how you can use JavaScript in WebView.
This document cover: Getting HTML from the WebView, Entering text in the text box on the website, Simulate click to click a website button
await webView.InvokeScriptAsync("eval", new string[] { functionString }) - to use JavaScript.documentElement - to get a reference to the root node of the document.getElementsByClassName(Class_Name) - to get elements usign Class Name.getElementsByTagName(Tab_Name) - to get elements using Tag Name.getElementById(ID) - to get element using ID.nodeName - to get the node name.childNodes - to get the child elements.outerHTML - to Get the Outer HTML.innerHTML - to Get the Inner HTML.innerText - to Get or Set InnerText.click() - to Simulate clickHere is a Sample app to LogIn to StackOverFlow