 Marc Andreessen's 1993 Mosaic and 1994 Netscape introduced mixed text and images for non-technical users.HTML evolved during the 1990s, leading to HTML 4 which introduced large elements of CSS styling and, later, extensions to allow browser code to make calls and ask for content from servers in a structured way (AJAX).There are nearly insurmountable problems in supplying a historiography of the Internet's development.