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very very confuse


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hi there i am very stuck with this problem   i know pos.top has value in it, i dont uderstand pos.top - 30 i know its substracting but i dont understand it but i dont understand .css('top ', pos.top -30 + 'px') , 

where this is from jquery

var pas = $(this).position();


       .css('top', pos.top - 30 +'px')

       .css('left', pos.left + 'px');

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