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Presentational markup describes the appearance of the text, regardless of its purpose For example boldface 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. The general form of an HTML element is therefore: content . Class attributes are used semantically in microformats. It was the first version developed and standardized exclusively by the W3C, as the IETF had closed its HTML Working Group in September 1996. Initially code-named Wilbur, HTML 3.2 dropped math formulas entirely, reconciled overlap among various proprietary extensions and adopted most of Netscapes visual markup tags. For example, an HTML document might semantically use the designation class="notation" to indicate that all elements with this class value are subordinate to the main text of the document. I claim you could learn HTML by looking over this book. The value may be enclosed in single or double quotes, although values consisting of certain characters can be left unquoted in HTML (but not XHTML). Leaving attribute values unquoted is considered unsafe. In contrast with name-value pair attributes, there are some attributes that affect the element simply by their presence in the start tag of the element, like the ismap attribute for the img element. There are several common attributes that may appear in many elements: The id attribute provides a document-wide unique identifier for an element. In 1989, Berners-Lee wrote a memo proposing an Internet-based hypertext system. Berners-Lee specified HTML and wrote the browser and server software in the last part of 1990.
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