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In what language does and - hash - three - nine - semicolon (') represent the apostrophe? I had some website data extracted in JSON format where some of the user comments had apostrophe which
< < > > " " & & ' ' This will make sure you're not accidentally writing markup when you want to write these characters. This is especially important for user input, to maintain security. It's less obvious, but it's actually important to escape ".
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Sometimes, people do this replacement step twice by accident (once in client side JavaScript and once on the server, for example). So, they replace " with ', and then when they do the replacement again they get '. Then the browser interprets the first code and thinks you meant to display '.
HTML Ampersand Character Codes These are character sequences that may appear in HTML documents; they represent sometimes useful symbols that are not part of the standard ASCII set or that would be difficult or impossible to type otherwise (e.g. the less-than sign, which would always be mistaken for the beginning of an HTML tag).
If you want one to appear in text on a web page you should use the encoded named entity "&"—more technical mumbo-jumbo at w3c.org. While most web browsers will let you get away without encoding them, stuff can get dicey in weird edge cases and fail completely in XML.
Predefined Character Entities Summary. This table lists the predefined character entities of HTML, derived from chapter 24 of the HTML specification. (Note that the "'" entity is only available in XHTML and not in plain HTML.) For each character, the first column gives the Unicode hexadecimal number of the character, the second gives a sample of the character, the third gives the ...
& ampersand & < less than sign < > greater than sign > " the double quote sign " Appendix II lists a broad range of characters and symbols, relating their ISO names to the corresponding character codes in common character sets. They allow authors to include accented characters in 7-bit ASCII documents.
Ampersands are escaped like & If I write this HTML as Ampersands are escaped like & it will be displayed as: Ampersands are escaped like & So I actually need to write:
Ampersands are escaped like & which displays correctly as: Ampersands are escaped like &
Authors should use "&" (ASCII decimal 38) instead of "&" to avoid confusion with the beginning of a character reference (entity reference open delimiter). Authors should also use "&" in attribute values since character references are allowed within CDATA attribute values.