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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.
Web pages authored using HyperText Markup Language may contain multilingual text represented with the Unicode universal character set.Key to the relationship between Unicode and HTML is the relationship between the "document character set", which defines the set of characters that may be present in an HTML document and assigns numbers to them, and the "external character encoding", or "charset ...
An optional step that can be taken for better (and correct) display of characters with ligature forms, combined characters, after the previously mentioned steps were followed, is to install a rendering engine software. For displaying individual special characters, HTML decimal or hexadecimal numeric entity codes can be used in the place of the ...
For example, the character é (Small e with acute accent, HTML entity code é) can be obtained by pressing Alt+1 3 0. First press the Alt key (and keep it depressed) with your left hand, then press the digit keys 1, 3, 0, in sequence, one by one, in the right-side numeric keypad part of the keyboard, then release the Alt key.
F. the default order of the entities is a) per ascending number of code points, b) per ascending value of the code points G. there are no duplicate code points (so that named entities with the same code points are gropued in the same row)
HTML entities – An encoding of special characters in HTML, mostly optional, but required for certain characters to escape interpretation as markup. While failure to apply this transformation is a vulnerability (see cross-site scripting ), applying it too many times results in garbling of these characters.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.