Hi,
There is no such thing as progress changed for regular page load. For regular page load, the browser engine would load the main HTML page, then if the main HTML uses any external resources (such as images, CSS files, script, etc), it would start to load them. Multiple such dependency resources can load simultaneously while the main HTML page is still being loaded. So a single progress information does not exist.
The only scenario progress exists is when downloading a file. In that case you can handle download related event to get progress changed notification:
https://www.essentialobjects.com/doc/webbrowser/customize/download.aspxThanks!