/usr/share/mercurial/templates/spartan/header.tmpl is in mercurial-common 4.5.3-1ubuntu2.
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 7 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<link rel="icon" href="{staticurl|urlescape}hgicon.png" type="image/png">
<meta name="robots" content="index, nofollow" />
<link rel="stylesheet" href="{staticurl|urlescape}style.css" type="text/css" />
<script type="text/javascript" src="{staticurl|urlescape}mercurial.js"></script>
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