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— or —
Is there a difference between these? Is one better-supported than the other?
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The backtick ` is a typographical mark used mainly in computing. It is also known as backquote, grave, or grave accent. The character was designed for typewriters to add a grave accent to a (lower-case) base letter, by overtyping it atop that letter.
What Does Backtick Mean? A backtick in computer science represents a “shell” form of command structure that some call a “double operator.” Essentially, the use of backticks allows for evaluating a string as part of a general command. It may be used in computing languages like Perl or other types of code.
SGML parsers (or XML parsers in the case of XHTML) can handle — without having to process the DTD (which doesn't matter to browsers as they just slurp tag soup), while — 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.
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