CSS Almanac

left

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

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

"The Nudge" (Relative Position)

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

"The Place" (Absolute/Fixed Position)

If you apply a left value to an element with relative positioning, it will "place" that element at that value according to it's 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 left and right value, it will stretch the element to hit both of those values.

Browser Support