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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.
HTML/XML named entity:   punctuation space: U+2008: 8200 Yes: No Common: General Punctuation: Separator, space As wide as the narrow punctuation in a font, i.e. the advance width of the period or comma. [1] HTML/XML named entity:   thin space: U+2009: 8201 Yes: No Common: General Punctuation: Separator, space Thin space; one-fifth ...
A whitespace character is a character data element that represents white space when text is rendered for display by a computer.. For example, a space character (U+0020 SPACE, ASCII 32) represents blank space such as a word divider in a Western script.
Incorrect HTML entity escaping may also open up security vulnerabilities for injection attacks such as cross-site scripting. If HTML attributes are left unquoted, certain characters, most importantly whitespace, such as space and tab, must be escaped using entities. Other languages related to HTML have their own methods of escaping characters.
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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 format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
HTML/XML named entity:   punctuation space: U+2008: 8200 Yes: No Common: General Punctuation: Separator, space As wide as the narrow punctuation in a font, i.e. the advance width of the period or comma. [1] HTML/XML named entity:   thin space: U+2009: 8201 Yes: No Common: General Punctuation: Separator, space Thin space; one-fifth ...
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