/usr/share/javascript/prettify/lang-yaml.js is in libjs-prettify 2013.03.04+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | var a=null;
PR.registerLangHandler(PR.createSimpleLexer([["pun",/^[:|>?]+/,a,":|>?"],["dec",/^%(?:YAML|TAG)[^#\r\n]+/,a,"%"],["typ",/^[&]\S+/,a,"&"],["typ",/^!\S*/,a,"!"],["str",/^"(?:[^\\"]|\\.)*(?:"|$)/,a,'"'],["str",/^'(?:[^']|'')*(?:'|$)/,a,"'"],["com",/^#[^\r\n]*/,a,"#"],["pln",/^\s+/,a," \t\r\n"]],[["dec",/^(?:---|\.\.\.)(?:[\r\n]|$)/],["pun",/^-/],["kwd",/^\w+:[ \r\n]/],["pln",/^\w+/]]),["yaml","yml"]);
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