image - jquery - picture element swap in ie 11 -


hi using piece of jquery swap background images via picture element depending on viewport width. works in mst browser except ie 11.

does have idea why? appreciated. in advance.

function setimgbackground(){ $('.banner-item').each( function(){   var $this = $(this);   var picture = $this.find('picture').get(0);   var src = picture.getelementsbytagname('img')[0].currentsrc;    $(this).css({       'background-image':'url('+src+')'   });  }); }   <ul class="bannercontainer"> <li class="banner-item full about"> <picture>   <!--[if ie 9]></video><![endif]-->   <source srcset="https://via.placeholder.com/1664x412?  text=desktop_1664x412" media="(min-width: 960px)">     <source srcset="https://via.placeholder.com/768x500?text=tablet_768x500"  media="(min-width: 768px)">   <source srcset="https://via.placeholder.com/414x500?text=mobile_414x500"  media="(min-width: 0px)">   <!--[if ie 9]></video><![endif]-->   <img alt="product" class="mobilebg"> </picture> </li> </ul>

here link codepen


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