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a start tag (in the form <tag>) marking the beginning of an element, which may incorporate any number of HTML attributes; some amount of text content, but no elements (all tags, apart from the applicable end tag, will be interpreted as content); an end tag, in which the element name is prefixed with a slash: </tag>. In some versions of HTML ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
Where element names the HTML element type, and attribute is the name of the attribute, set to the provided value. 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). [2] [3] Leaving attribute values unquoted is considered unsafe. [4]
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the ...
There is another kind of character reference called a character entity reference, which allows a character to be referred to by a name instead of a number. (Naming a character creates a character entity.) HTML defines some character entities, but not many; all other characters can only be included by direct encoding or using NCRs.
Some HTML elements are defined as empty elements and take the form < tag attribute1 = "value1" attribute2 = "value2" >. Empty elements may enclose no content, for instance, the < br > tag or the inline < img > tag. The name of an HTML element is the name used in the tags. The end tag's name is preceded by a slash character /. If a tag has no ...
HTML5 uses a DOCTYPE declaration which is very short, due to its lack of references to a DTD in the form of a URL or FPI. All it contains is the tag name of the root element of the document, HTML. [10] In the words of the specification draft itself: <!DOCTYPE html>, case-insensitively.
The implicit directional marks are non-printing characters used in the computerized typesetting of bi-directional text containing mixed left-to-right scripts (such as Latin and Cyrillic) and right-to-left scripts (such as Persian, Arabic, Syriac and Hebrew).