Download as bitmap (test)

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js"></script>
<title>Download SVG</title>
<style type="text/css">
#download{
    cursor: pointer;
    text-decoration: none;
    color: black;
}
</style>
</head>
<body>

<div id="viz"></div>
<a href="#" id="download">Download</a>

// Modified from https://groups.google.com/d/msg/d3-js/aQSWnEDFxIc/k0m0-q-3h1wJ

d3.select("#viz")
    .append("svg:svg")
    .attr("width", 300)
    .attr("height", 200)
    .style("background-color", "WhiteSmoke")
    .append("svg:rect")
    .attr("fill", "aliceblue")
    .attr("stroke", "cadetblue")
    .attr("width", 60)
    .attr("height", 40)
    .attr("x", 50)
    .attr("y", 50);

d3.select("#download")
    .on("mouseover", writeDownloadLink);

</script>

</body>
</html>

Modified http://mbostock.github.com/d3/d3.js to a secure url

https://mbostock.github.com/d3/d3.js