index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="https://d3js.org/d3.v4.js"></script>
<script>
d3.xml("rect01.svg").mimeType("image/svg+xml").get(function(error, xml) {
if (error) throw error;
document.body.appendChild(xml.documentElement);
});
</script>
rect01.svg
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="12cm" height="4cm" viewBox="0 0 1200 400"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<desc>Example rect01 - rectangle with sharp corners</desc>
<!-- Show outline of canvas using 'rect' element -->
<rect x="1" y="1" width="1198" height="398"
fill="none" stroke="blue" stroke-width="2"/>
<rect x="400" y="100" width="400" height="200"
fill="yellow" stroke="navy" stroke-width="10" />
</svg>