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.
"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"
"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"