Typically, strong emphasis emboldens text in a visual web browser and emphasis italicizes text. Deprecated and nonstandard physical styles Many physical elements are considered obsolete, including the infamous blink (a Netscape ???innovation??? used to flash text on and off, amusingly still supported in Firefox). Some physical styles are deprecated: u (underline) and s (strikethrough; also strike) have CSS equivalents using the text-decoration property (text-decoration: underline and text-decoration: line-through, respectively). The big and small elements The big and small elements are used to increase and decrease the size of inline text (even text defined in pixels in CSS). An example of the use of small might be in marking up text that is semantically small print. An example of big might be to denote that a drop cap is a big character, or for when adding asterisks to required form fields. * Note, however, that the change in size depends on individual web browsers, so it??™s often better to use span elements with a specific class relating to a font size defined in CSS (see the section ???Creating alternatives with classes and spans??? later in the chapter), or ensure that you define specific values in CSS for small and big elements when used in context. Teletype, subscript, and superscript This leaves three useful physical styles.