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Display special chars in HTML Textbox

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answered on 14 Apr 2021, 09:56 AM

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[Definition: Entity and character references may both be used to escape the left angle bracket, ampersand, and other delimiters. A set of general entities (amp, lt, gt, apos, quot) is specified for this purpose. Numeric character references may also be used; they are expanded immediately when recognized and must be treated as character data, so the numeric character references " < " and " & " may be used to escape < and & when they occur in character data.]
All XML processors must recognize these entities whether they are declared or not. For interoperability, valid XML documents should declare these entities, like any others, before using them. If the entities lt or amp are declared, they must be declared as internal entities whose replacement text is a character reference to the respective character (less-than sign or ampersand) being escaped; the double escaping is required for these entities so that references to them produce a well-formed result. If the entities gt, apos, or quot are declared, they must be declared as internal entities whose replacement text is the single character being escaped (or a character reference to that character; the double escaping here is optional but harmless). For example:
<!ENTITY lt "&#60;">

<!ENTITY gt ">">

<!ENTITY amp "&#38;">

<!ENTITY apos "'">

<!ENTITY quot """>

Refer to https://www.w3.org/TR/REC-xml/#dt-escape