https://www.an10.com.br/wp-content/plugins/angwp/include/extension…/assets/js/spr_inViewport.js?ver=1.6.2

1// Return the visible amount of px
2// of any element currently in viewport.
3// https://stackoverflow.com/a/27462500/3481803
4// http://jsfiddle.net/RokoCB/tw6g2oeu/7/
5/**
6 * $(".example").inViewport(function(px){ if(px) $(this).addClass("class"); }, {padding:0});
7 *
8*/
9;(function($, win) {
10  $.fn.inViewport = function(cb, options) {
11	  
12	  // Defaults
13	  var settings = $.extend({
14		 padding: 0 // Add delay
15	  }, options );
16	  
17     return this.each(function(i,el){
18		//var func = function(px){if(px) $(this).addClass(settings.class+' '+$(this).data('animation'));};
19       function visPx(){
20         var H = $(this).height(),
21             r = el.getBoundingClientRect(), t=r.top+settings.padding, b=r.bottom+settings.padding;
22         return cb.call(el, Math.max(0, t>0? H-t : (b<H?b:H)));  
23       } visPx();
24       $(win).on("resize scroll", visPx);
25     });
26  };
27}(jQuery, window));