"Flot: Attractive JavaScript plotting for jQuery." Compatible with IE8, though IE8 will need to emulate an HTML5 canvas (using ExCanvas). Demo draws a simple graph.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Hello Flot</title>
<script type="text/javascript"
language="javascript"
src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.11.2/jquery.js">
</script>
<!-- ExCanvas source code is included in Flot distribution. -->
<!--[if lte IE 8]>
<script language="javascript" type="text/javascript" src="excanvas.js"></script>
<![endif]-->
<!-- http://www.flotcharts.org -->
<script type="text/javascript" language="javascript" src="jquery.flot.js"></script>
</head>
<body>
<div id="placeholder" style="width:600px;height:300px"></div>
<script type="text/javascript" language="javascript">
$(document).ready(function() {
var data = [[0, 0], [1, 1]];
var options = { yaxis: { max: 1 } };
// Note that the data argument should be wrapped in an array.
$.plot($("#placeholder"), [data], options);
});
</script>
</body>
</html>