The fadeIn() method gradually changes the opacity, for selected elements, from hidden to visible (fading effect).
A method to remove specific class(es) from a DOM element.
"For some reason fadein works better than show or simply removing a hidden class via removeclass if you take that approach"
from question "Smoothly preload largeish background images"
"That s because removeclass is executed faster than fadein method you can remove the class when animation is complete"
from question "Delayed effect on showing new rows in table"