css - Strange behavior in jQuery top vs. bottom position -


i'm seeing strange difference between top , bottom positioning. i've put 4 quick examples demonstrate issue:

jsfiddle

//example 1 $('#box1').hover(function () {     var offset = $('#box1').offset();     $("#containment-wrapper1").css({         bottom: offset.top     }); });  //example 2 $('#box2').hover(function () {     var x = $('#box2').css('top');     $("#containment-wrapper2").css({         bottom: x     }); });  //example 3 $('#box3').hover(function () {     var x = $('#box3').css('top');     $("#containment-wrapper3").css({         top: x     }); });  //example 4 $('#box4').hover(function () {     var offset = $('#box4').offset();     $("#containment-wrapper4").css({         top: offset.top     }); });

examples 3 , 4, behave expected, top border lines bottom border.

examples 1 , 2 not. there seems 30px difference.

is bug or missing something?

there no bug , no strange behaviour.

you've set of containers position: fixed. therefore positioning relative window.

so while distance top never change, distance bottom vary based on screen size. if resize window see position changes , @ point box line up.

the fact measuring distance top , applying bottom makes more fail screen have right size.

basically, asking:
if box is, say, 100px top, why when make containment-wrapper 100px bottom don't line up?


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