@GRAVEYARDFUN
If you hadn’t figured it out before it was yanked, it was an ::after pseudo element on the images, making it not actually part the markup/DOM.
<div id="burger"> is for the "burger menu" you get on mobile (or when you slim the browser window).
The button for it appears to the left of "Derpibooru":

make it great
murica
buuuuuuuuuuuuurger
If you hadn’t figured it out before it was yanked, it was an
::afterpseudo element on the images, making it not actually part the markup/DOM.Edited because: technically correct is best correct
I know, but still
it’s a burger