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In computing, an HTML element (instance) in terms of SGML is the complete sequence of a start tag (with attributes and their value s), any embedded HTML content, and the end tag. A special case is empty element s that don't have contents and end tags. Due to the constraints of the DTDs, various parts, including start and end tag, may be omitted in HTML, but not XHTML. In XHTML the minimized tag syntax for an empty element (abbreviated form of the combination of opening and closing tag) is e.g. .
Informally, HTML elements or their attributes are often simply called "tags" (an example of synecdoche), though many prefer the term tag strictly in reference to the semantic structures delimiting the start and end of an element.
Yourock!
has an em element nested inside a p element. This can become more complex, for example 1 Children that do not clean up their rooms
. Nesting may be arbitrarily deep. Tags must be closed in the reverse order that they've been opened.
Lucy kissed Jimmy
Lucy kissed Jimmy
Nesting is restricted partly on the basis of whether an element is block-level or inline. A block-level element typically begins on a new line, while an inline element typically does not; a block-level element may contain other block-level elements or inline elements, while an inline element may only contain other inline elements. Examples of block-level elements include paragraphs, lists, tables, headings, and the div generic container element. Examples of inline elements include structured text such as emphasis, citations, or abbreviations, as well the span generic container element.
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My first webpage will render as "My first webpage", and not "My first webpage".
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, used to specify commands which should be sent as HTTP headers.
(XHTML: )
/*url "; @import "url "; /*]]>*/
All body tags are block-level elements, and cannot be contained within an inline element.
2
through 2.1.1
h1 for the highest-level heading (for example the document title), h2 for a lower-level heading (a major section), h3 for a level below that (for example a subsection), etc. The lowest level heading is h6. Most web browsers will show h1 as large text in a different font, and h6 as small boldfaced text, but this can be overridden with CSS. The heading elements are not intended merely for creating large or bold text.