clientrect-contains.js

// Why aren't we native yet?
ClientRect.prototype.contains = function (x, y) {
  // support 1 arg of {x: ##, y: ##}
  if (x && x.x && !y) {
    y = x.y;
    x = x.x;
  }
  return (x >= this.left && x <= this.right &&
          y >= this.top && y <= this.bottom);
};