Visualization chart with D3
HTML
<svg height="250" width="250">
<rect x="50" y="50" height="20" width="20"></rect>
</svg>
JavaScript
var svg = d3.select("body").append("svg");
svg.attr("width",250);
svg.attr("height",250);
var rect = svg.append("rect");
rect.attr("x",50);
rect.attr("y",50);
rect.attr("width",20);
rect.attr("height",20);