I needed a fun project and this is something I've wanted to do with an industry-related image. The JavaScript is used to clone the .preloader-template group so I didn't have to create a ton of HTML. At some point, I may make an actual JS function for this to showcase these better.
Simple left to right animation. Probably needs some tweaking as I'm only guessing at the needed group length when compensating for the window width.
Simple right to left animation. Same as above, just moving in the opposite direction.
Moves back and forth. Could easily be tweaked to use fewer groups as there isn't much use for all of them now.
Added in psuedo class text that to make a more complex looking preloader.
Animation is setup to emulate a loading bar. Obviously it needs tweaking as there are too many groups, the width is too large and the animation takes too long to complete. If you made it this far and it isn't doing anything, just wait a few seconds and it'll start again...