The article discusses a website that is contained within a single HTML file, using CSS to show and hide different sections of the page. This is achieved through the use of the :target pseudo selector, which allows the website to display different content without the need for JavaScript. The website appears to be a standard multi-page site, but all the content is loaded at once, which can be a drawback for mobile users or those with slow internet connections. The technique used is not new, but it is still an interesting example of what can be done with HTML and CSS.