Css Top. Get certified by completing a course today. The difference can be seen when you compare them on a page that has enough content to scroll.
However using toggle switches is a far better choice as it allows you to select. The property allows you to specify how far the element is offset from the top edge of its containing block for absolute positioning or from where the positioned elements top edge would normally have been for relative positioning. Jquery the browser actually would just create that css property if its not already filled.
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The value in the css margin top property can be expressed as either a fixed value or as a percentage. However using toggle switches is a far better choice as it allows you to select. As you scroll down the fixed position element is always in view while the absolute position element scrolls away. Wouldnt this fail if the top css property isnt explicity set.