/usr/share/source-highlight/html_ref.outlang is in libsource-highlight-common 3.1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # for html references and anchors
anchor "<a name=\"$linenum\">$text</a>"
postline_reference "<a href=\"$outfile#$linenum\">$text -> $infile:$linenum</a>"
postdoc_reference "<a href=\"$outfile#$linenum\">$text -> $infile:$linenum</a>"
reference "<a href=\"$outfile#$linenum\">$text</a>"
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