/usr/share/doc/libjs-rickshaw/examples/negative.html is in libjs-rickshaw 1.5.1.dfsg-2.
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 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32  | <!doctype>
<link type="text/css" rel="stylesheet" href="css/graph.css">
<link type="text/css" rel="stylesheet" href="css/lines.css">
<script src="/usr/share/javascript/d3/d3.js"></script>
<script src="/usr/share/javascript/rickshaw/rickshaw.js"></script>
<div id="chart"></div>
<script>
var graph = new Rickshaw.Graph({
	unstack: true,
	element: document.querySelector("#chart"),
	width: 580,
	height: 250,
	min: 'auto',
	renderer: 'bar',
	series: [ {
		color: 'steelblue',
		data: [ { x: 0, y: 20 }, { x: 1, y: 3 }, { x: 2, y: 15 }, { x: 3, y: 42 } ]
	}, {
		color: 'tomato',
		data: [ { x: 0, y: 12 }, { x: 1, y: -20 }, { x: 2, y: 18 }, { x: 3, y: 8 } ]
	} ]
});
graph.render();
</script>
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