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The non-breaking space works within links exactly like a regular space. Thus you can link to [[J. R. R. Tolkien]] directly and it will render as J. R. R. Tolkien. The initials will not be separated across a line break. However, renders the source text harder to read and edit. Avoid using it unless it is really necessary to ...
This template can be used to cause an indentation after a linebreak, in unbulleted lists inside infoboxes and in tables with constrained cell widths, by using {{wbr}} between words in an entry, so that when they wrap they are not mistaken for separate entries.
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).
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.
Its semantics and HTML implementation are similar to the soft hyphen, but soft hyphens display a hyphen character at the point where the line is broken. The zero-width space can be used to mark word breaks in languages without visible space between words, such as Thai , Myanmar , Khmer , and Japanese .
HTML provides four variations on space width and one fixed-width non-breaking space: <space>,  ,  , and   (all breaking); and (non-breaking). In a typewriter font, <space> will equal   , but will vary according to the font designer's specification in all other fonts, whether proportional or monospace.
Using to prevent line break is not needed; the {} template will prevent line breaks anyway; you can use <br /> if you need an explicit line break inside a formula. Markup Renders as