Minimal lazyload script with IE support

lazyload.js

(function(){
var supportsPassive = false;
try {
  var opts = Object.defineProperty({}, 'passive', {
    get: function() {
      supportsPassive = true;
    }
  });
  window.addEventListener("testPassive", null, opts);
  window.removeEventListener("testPassive", null, opts);
} catch (e) {}
window.addEventListener('scroll', lazyload, supportsPassive ? { passive: true, once:true } : false);
function lazyload(e){
  supportsPassive || window.removeEventListener('scroll', lazyload, false);
  var _imgs = document.querySelectorAll('img[data-src],img[data-srcset]');
	for (var i=0; i<_imgs.length; i++) {
	    if(_imgs[i].getAttribute('data-src')) {
	       _imgs[i].setAttribute('src',_imgs[i].getAttribute('data-src'));
	       _imgs[i].removeAttribute('data-src');
	    }
	    if(_imgs[i].getAttribute('data-srcset')) {
	       _imgs[i].setAttribute('srcset',_imgs[i].getAttribute('data-srcset'));
	       _imgs[i].removeAttribute('data-srcset');
	    }
	}
}
})();