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In mathematical typography, the widths of spaces are usually given in integral multiples of an eighteenth of an em, and 4/18 em may be used in several situations, for example between the a and the + and between the + and the b in the expression a + b. [5] HTML/XML named entity:  , LaTeX: \: (the LaTeX medium space is a no-break space)
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.
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.
A narrow space character, used in Mongolian to cause the final two characters of a word to take on different shapes. [5] It is no longer classified as space character (i.e. in Zs category) in Unicode 6.3.0, even though it was in previous versions of the standard.
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).
Avoid "fixing" white space issues which are peculiar to your combination of screen, window, and font sizes, your choice of browser, your image settings, and so on. Check with other settings or systems, or ask other editors to check them for you. Avoid "fixes" which break the appearance of the page on mobile devices.
It is necessary for disambiguating compounds from non-compound words, which use a full space. In the Jawi script of Malay , ZWNJ is used whenever more than one consonants are written at the end of any phrase ( سا ء ينس , Malay for 'science' or sains in Latin script, pronounced /ˈsa.ɪ ns /.)
<pre> is a parser tag that emulates the HTML <pre> tag. It defines preformatted text that is displayed in a fixed-width font and is enclosed in a dashed box. HTML-like and wiki markup tags are escaped, spaces and line breaks are preserved, but HTML elements are parsed.