in book/master_middleman/source/javascripts/waypoints/noframeworkAdapter.js [116:127]
NoFrameworkAdapter.prototype.outerWidth = function(includeMargin) {
var width = this.innerWidth()
var computedStyle
if (includeMargin && !isWindow(this.element)) {
computedStyle = window.getComputedStyle(this.element)
width += parseInt(computedStyle.marginLeft, 10)
width += parseInt(computedStyle.marginRight, 10)
}
return width
}