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The top property in CSS goes hand in hand with positioning. By default, elements are static positioned in which the top property has no effect whatsoever. But when the positioning of an element is relative, absolute, or fixed, the top value plays a big role.

div {
  top: value (px, em, %, pt, etc) || auto || inherit;   /* can be negative */
}

"The Nudge" (Relative Position)

If you apply a top value to an element with relative positioning, it will "nudge" the element that direction.

Negative values will "pull" the element in that direction.

If you apply both a top and bottom value, only the top value will be honored.

"The Place" (Absolute/Fixed Position)

If you apply a top value to an element with relative positioning, it will "place" that element at that value according to its nearest positioning context (meaning: it's nearest parent element with some positioning value other than static, or the document itself).

Note that if you apply both a top and bottom value, it will stretch the element to hit both of those values.

Browser Support

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Comments

  1. muaz
    Permalink to comment#

    i am not undestanding the top value for absolute position

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