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In HTML the horizontal tab is coded using 	 or 	 [9] [10] but as with all whitespace characters in HTML, this will be displayed as a single space except inside <pre>, <code> tags (or other elements with CSS attribute white-space set to pre). Here is an example: HTML
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).
In computer programming, indentation style is a convention, a.k.a. style, governing the indentation of blocks of source code.An indentation style generally involves consistent width of whitespace (indentation size) before each line of a block, so that the lines of code appear to be related, and dictates whether to use space or tab characters for the indentation whitespace.
The C language defines whitespace characters to be "space, horizontal tab, new-line, vertical tab, and form-feed". [29] The HTTP network protocol requires different types of whitespace to be used in different parts of the protocol, such as: only the space character in the status line, CRLF at the end of a line, and "linear whitespace" in header ...
Common variations in the implementation of indentation include: how much to indent a block at each level of the code hierarchy, usually measured in spaces, and whether to store whitespace characters as space or tab characters. Although there are common practices, consensus is not universal.
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.
<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.