css - jQuery on load event do not trigger script -

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first looking @ onload event, when read it, discovered or going deprecated, search , found info use on event check if image loaded:load() method deprecated?

but simple animation trigger, not work. element not visible. works if reload browser. animation worked perfect until added load event. wrong , how can improve code work better?

    $("#intro-img").on("load", function() {      $(".intro-content").animate({     left: '20px',     opacity: '1.0'     });  });

edit: script running after used window instead of id. $(window).on("load", function() {.... script should run when content on page has been loaded? guess there never guarantee work 100% images!? 

$('#book').on("load",function(){   //animate });

problem approach when image loaded cache load event has possibility never triggered.when image first downloaded jquery can have chance attach event before image loaded , work expected.but if image loaded via cache jquery may not have.

$('#book').on("load",function(){   $(".intro-content").animate({     left: '20px',     opacity: '0.5',     height:"300px"     }); }).each(function(){   if(this.complete) {     $(this).trigger('load');   } });

this code attaches event , checks whether image loaded , triggers load event.


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