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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.
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.
The HTML codes can be used where a literal character would cause confusion, such as using code "[" or "]" to show the left or right square bracket ('[' or ']'). Some editors, upon seeing a single bracket '[' at a word will edit a page to put double-bracket '[[' as thinking a single bracket must be an obvious typo, but an HTML code of ...
In HTML 4, there is a standard set of 252 named character entities for characters - some common, some obscure - that are either not found in certain character encodings or are markup sensitive in some contexts (for example angle brackets and quotation marks). Although any Unicode character can be referenced by its numeric code point, some HTML ...
The format is the same as for any entity reference: &name; where name is the case-sensitive name of the entity. The semicolon is required. Because numbers are harder for humans to remember than names, character entity references are most often written by humans, while numeric character references are most often produced by computer programs. [1]
html hex html hex html hex html hex dec picture dec picture dec picture dec picture ⎀ insertion symbol ⎐ open-circuit-output l-type symbol ⎠ right parenthesis lower hook ⎰ upper left or lower right curly bracket section 0 ⎀ ⎐ ⎠ ⎰ ⎀ ⎐ ⎠ ⎰ ⎁ continuous underline symbol ⎑ passive-pull ...
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In SGML, XML, and HTML, the ampersand is used to introduce an SGML entity, such as (for non-breaking space) or α (for the Greek letter α). The HTML and XML encoding for the ampersand character is the entity &. [38] This can create a problem known as delimiter collision when converting text into one of these markup languages.