Generally, it does not matter whether the URL contains parameters or not, because this is handled by the web server. The browser simply downloads and displays what the web server returns.
For IPro (IpHtmPanel), an example -
browser.lpi - is located in the Lazarus directory in the subdirectory:
components\turbopower_ipro\examples\As for CEF, the example from this post allows you to enter your own URL:
https://forum.lazarus.freepascal.org/index.php/topic,71856.msg566025.html#msg566025 or samples from the CEF4Delphi component