HTML elements are the building blocks of HTML pages. With HTML constructs, images and other objects such as interactive forms may be embedded into the rendered page. HTML provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes, and other items.
The first version of HTML was written by Tim Berners-Lee in 1993. Since then, there have been many different versions of HTML, including HTML 4.01, XHTML, and HTML5.
CSS is designed to enable the separation of content and presentation, including layout, colors, and fonts. This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, and reduce complexity and repetition in the structural content.
CSS has evolved through several versions, including CSS1, CSS2, CSS3, and the current modular CSS approach.