gistfile1.js

// With SVG.js

var width  = 500
var height = 20
var lineHeight = 3
var step   = 10
var draw   = SVG('canvas')
var rect   = draw.rect(width, height).fill('#f09')

for (var i = 1; i < width/step; i++) {
  var x1 = i * step
  var y1 = -step
  var x2 = i * step
  var y2 = lineHeight
  draw.line(x1, y1, x2, y2).stroke({ width: 1, color: '#000' }) 
}