Abstract: A method, apparatus, and computer-readable medium for authoring and executing HTML application files is disclosed. An HTML application file is basically a standard HTML file that runs in its own window outside of the browser, and is thus not bound by the security restrictions of the browser. The author of an HTML application file can take advantage of the relaxed security. The author of the HTML application file designates the file as an HTML application file by doing one or more of the following: defining the MIME type as an HTML application MIME type; or using an HTML application file extension for the file. When a browser, such as the Internet Explorer, encounters one of the above, it processes the file as an HTML application file rather than a standard HTML file by creating a main window independent of the browser, and rendering the HTML in the main window.