This returns the same number as the '<a  href='Core/length'>length</a>' property of the jQuery object
Example:
Example:
Count the divs. Click to add more.
$(document.body).click(function () {
          $(document.body).append($("<div>")); 
       var n = $("div").size(); 
       $("span").text("There are " + n + " divs." +                      "Click to add more.");     }).click(); // trigger the click to start
<span></span>   <div></div>
body { cursor:pointer; } 
div { width:50px; height:30px; margin:5px; float:left; 
background:blue; }   span { color:red; }
 
 
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