<Dt> Presentational markup indicates the appearance of the text, regardless of its purpose </Dt> <Dd> For example, <b> boldface </ b> indicates that visual output devices should render "boldface" in bold text, but gives little indication what devices that are unable to do this (such as aural devices that read the text aloud) should do . In the case of both <b> bold </ b> and <i> italic </ i>, there are other elements that may have equivalent visual renderings but that are more semantic in nature, such as <strong> strong text </ strong> and <em> emphasised text </ em> respectively . It is easier to see how an aural user agent should interpret the latter two elements . However, they are not equivalent to their presentational counterparts: it would be undesirable for a screen - reader to emphasize the name of a book, for instance, but on a screen such a name would be italicized . Most presentational markup elements have become deprecated under the HTML 4.0 specification in favor of using CSS for styling . </Dd> <Dt> Hypertext markup makes parts of a document into links to other documents </Dt> <Dd> An anchor element creates a hyperlink in the document and its href attribute sets the link's target URL . For example, the HTML markup, <a href = "http://www.google.com/">Wikipedia</a>, will render the word "Wikipedia" as a hyperlink . To render an image as a hyperlink, an "img" element is inserted as content into the "a" element . Like "br", "img" is an empty element with attributes but no content or closing tag . <a href = "http://example.org"> <img src = "image. gif" alt = "descriptive text" width = "50" height = "50" border = "0"> </ a>. </Dd>

Default text for main content of a web page