They probably use WebKit to render the HTML to a buffer and then compress it, save to disk. If you were asking more generally, see this discussion[1] on the We

They probably use WebKit to render the HTML to a buffer and then compress it, save to disk. If you were asking more generally, see this discussion[1] on the WebKit mailing list, and these Qt links[2, 3] that I found in that thread. [1] http://www.nabble.com/Webkit-capture-web-page-content-API-td23516755.html http://www.nabble.com/Webkit-capture-web-page-content-API-td... [2] http://labs.trolltech.com/blogs/2008/11/03/thumbnail-preview-of-web-page/ http://labs.trolltech.com/blogs/2008/11/03/thumbnail-preview... [3] http://labs.trolltech.com/blogs/2009/01/15/capturing-web-pages/ http://labs.trolltech.com/blogs/2009/01/15/capturing-web-pag...