{
const container = d3.select(DOM.svg(300,300)).attr("style","background:black")
for(let i = 0;i<100;i = i + 1){
const x = d3.randomUniform(0,300)()
const y = d3.randomUniform(0,300)()
const width = d3.randomUniform(0,20)()
const height = d3.randomUniform(0,20)()
container.append("rect")
.attr("width",width)
.attr("height",height)
.attr("fill","white")
.attr("x",x)
.attr("y",y)
}
return container.node()
}