jQuery Forum

1. $(function(){ //document ready handler
   
2.     $( ".mask1" ).hover(function() {
3.         $(this).stop(true).fadeOut( "slow");
4.     });
5.     $( ".homepage-gallery" ).mouseleave(function() {
6.         $( ".mask1" ).stop(true).delay( 800 ).fadeIn( "slow");
7.     });
8. });

Also i removed your empty callback from fadeIn and fadeOut, if you don't need callback then you can omit that parameter.

Also always put your jQuery code inside document ready handler, it will safeguard your code. Like i did in above code.

https://jsfiddle.net/8jg09pdx/5/