How to Find Visible HTML Element by class in JavaScript?

We can use the same logic jQuery uses with this code:

element.offsetWidth > 0 && element.offsetHeight > 0;

You can simply go through the list of your class elements to find the one currently displayed.

for (var i = 0; i < document.getElementsByClassName('myclass').length; i++) 
{
   if (document.getElementsByClassName('myclass')[i].offsetWidth > 0 &&
       document.getElementsByClassName('myclass')[i].offsetHeight > 0) 
       {
           //found the visible element of class 'myclass'
            break;
       }
}