TIPS :: 
The TWebBrowser Delphi component allows displaying HTML and web *aware* documents inside your application.
If, for whatever the reason is, you have to clear the web browser window, "reset" it, and display an empty page, you need to navigate to a "blank" page. The tips shows you how...
Read the full article to learn how to Programmatically Reset the TWebBrowser Delphi control to an Empty (Blank) Page
Related: TWebBrowser Tips and Tricks | How to load HTML directly to a WebBrowser | Store Web-style content inside a Delphi application

More WebBrowser Delphi 7 source code,
http://wtwsoft.narod.ru/WebBrowser/index.htm