mdash or 8212 is there any difference in HTML output

Question

amp mdash  or  amp  8212   Is there a difference between these   Is one better-supported than the other

User · Accepted Answer

SGML parsers  or XML parsers in the case of XHTML  can handle  amp  8212  without having to process the DTD  which doesn t matter to browsers as they just slurp tag soup   while  amp mdash  is easier for humans to read and write in the source code   Personally  I would stick to a literal em-dash and ensure that my character encoding settings were consistent

User · Answer

From W3 web site Common HTML entities used for typography     For the sake of portability  Unicode entity references should be reserved for use in documents certain to be written in the UTF-8 or UTF-16 character sets  In all other cases  the alphanumeric references should be used    Translation  If you are looking for widest support  go with  amp mdash

User · Answer

amp mdash      amp  8212      u2014  When representing the m-dash in a JavaScript text string for output to HTML  note that it will be represented by its unicode value  There are cases when ampersand characters    amp    will not be resolved   notably certain contexts within JSX  In this case  neither  amp mdash  nor  amp  8212  will work  Instead you need to use the Unicode escape sequence   u2014    For example  when implementing a render   method to output text from a JavaScript variable   render        let text  JSX transcoders will preserve the  amp  character amp mdash to                   protect from possible script hacking and cross-site hacks      return         lt div gt  text  lt  div gt           This will output    lt div gt JSX transcoders will preserve the  amp  character amp mdash to protect from possible script hacking and cross-site hacks  lt  div gt    Instead of the  amp     prefixed representation  you should use  u2014   let text  JSX transcoders will preserve the  amp  character u2014to

User · Answer

They are exactly the same character  See  http   en wikipedia org wiki Dash  Barring browser bugs they will display the same in all cases  so the only difference would be concerning code readability  which would point to  amp mdash    Or  if you are using UTF-8 as a charset in your HTML document  you could enter the character directly  That would also display exactly the same

User · Answer

Could be that using the numeral code is more universal  as it s a direct reference to a character in the html entity table  but I guess they both work everywhere  The first notation is just massively easier to remember for a lot of characters

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