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For codes from 0 to 127, the original 7-bit ASCII standard set, most of these characters can be used without a character reference. Codes from 160 to 255 can all be created using character entity names. Only a few higher-numbered codes can be created using entity names, but all can be created by decimal number character reference.
Also known as "thick space". One third of an em wide. HTML/XML named entity:  , LaTeX: \; (the LaTeX thick space is a no-break space) four-per-em space: U+2005: 8197 Yes: No Common: General Punctuation: Separator, space Also known as "mid space". One fourth of an em wide. HTML/XML named entity:   six-per-em space: U+2006: 8198 Yes ...
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
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.
There exists a non-standard encoding for Unicode characters: %uxxxx, where xxxx is a UTF-16 code unit represented as four hexadecimal digits. For example, the 13th edition of ECMA-262 includes an escape function that uses this syntax. [ 2 ]
A second common application of non-breaking spaces is in plain text file formats such as SGML, HTML, TeX and LaTeX, whose rendering engines are programmed to treat sequences of whitespace characters (space, newline, tab, form feed, etc.) as if they were a single character (but this behavior can be overridden).
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More specifically, HTML 4.0 documents are required to consist of characters in the HTML document character set : a character repertoire wherein each character is assigned a unique, non-negative integer code point. This set is defined in the HTML 4.0 DTD, which also establishes the syntax (allowable sequences of characters) that can produce a ...