I've been looking for a button that on click displays a highlighted URL below/besides it and hides it again when pressed again. I recall seeing one before but I have no idea where it was and can't find any examples of it. 

I did find [Button that displays and hides a sliding menu](https://stackoverflow.com/questions/27038779/button-that-displays-and-hides-a-sliding-menu) but it wasn't quite what I was looking for and I'm not experienced enough to apply that code to make something similar but with a textbox proper formatted below the button.