If you click on the 'Storage' icon in the middle of the Web IDE screen, do you see any other files in Storage?
It might be that you already have other files in Storage that are stopping you having space to write your new code in?
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If you click on the 'Storage' icon in the middle of the Web IDE screen, do you see any other files in Storage?
It might be that you already have other files in Storage that are stopping you having space to write your new code in?