$('iframe').css('visibility','hidden') not working in Google chrome

I know this is a bit dated, but I just ran into the same problem. My solution was

css( 'opacity', 0 )

There are issues with actually making iframes invisible (i.e. using visibility:hidden or display:none). But you can make them disappear by being small enough

$('ul li').find('iframe').css({"height":"0", "width":"0", "border":"none"});