If the number is positive, the animation will start when the element is this number of pixels below the viewport. If the number is negative, the animation will not start until the element is this number of pixels inside the viewport.
If the number is positive, the animation will start when the element is this number of pixels below the viewport. If the number is negative, the animation will not start until the element is this number of pixels inside the viewport.
If the number is positive, the animation will start when the element is this number of pixels below the viewport. If the number is negative, the animation will not start until the element is this number of pixels inside the viewport.