> <b><font color="red">&01;</font></b></p>
Hm. .. I ignored that HTML tags could be injected too.
Enclosing line numbers in a span which is hidden by a onselect JS handler could be a solution for unintended selection.
Unfortunately no time for a prove of concept now.
FWIW, the source view in metacpan is pretty neat, no selection of line numbers and syntax highlighting.
Couldn't check yet how highlighting is implemented. ¹
¹) looks Perltidy'ish
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