' character entity not compatible with older HTML

A debian user writes [1]

highlight 3.41 uses "&apos;" for HTML output which only appears
in HTML 5.0 and XHTML.  This causes problems with older browsers
such as w3m which haven't been updated, yet (separate bug report
just filed).

I suggest using the "&#39;" entity, instead; which works with
all versions of HTML.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=927410

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&apos; character entity not compatible with older HTML

' character entity not compatible with older HTML