A certificate in HTML, or hypertext markup language, demonstrates a person's proficiency in HTML. It is used to construct the visual appeal and functional elements of website documents by web designers and other technical specialists. On the other hand, the CSS certificate enhances several web pages' styles and layouts to be managed using CSS. All of the pages in a website's navigation can have their appearance and layout changed using CSS. The CSS Certificate affirms a person's core understanding of cutting-edge CSS for web development.