| A | B |
| Cache | the browser's tempoary storage area for Web pages and images |
| Cascading Style Sheets (CSS) | allows authors to create style rules for elements and express them externally in a document known as a style sheet |
| Deprecated elements | elements that the W3C has identified as obsolete and consequently will not be included in future releases of HTML |
| Document Type Definition (DTD) | contains all the elements, attributes, and usage rules for the markup language you are using. |
| Extensible Hypertext Markup Language (XHTML) | Next generation of HTML |
| metalanguage | allows you to describe a markup language, allowing you to create your own elements to meet your information needs. |
| Hypertext | nonlinear way of organizing information |
| rendering engine | interprets the markup tags in an HTML file and displays the results in the browser |
| screen resolution | the width and height of the computer screen in pixels |
| Semantic markup | descriptive markup that identifies the intended use of different document sections |
| Standard Generalized Markup Language (SGML) | standard system for specifying document structure |
| Valid code | conforms to the rules of the W3C |
| well-formed document | one that adheres to the syntax rules described in this section |
| World Wide Web Consortium (W3C) | handle the need for new markup languages and standards to address demands |