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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.
@Gordon
I don't know why it would happen - the slow write is definitely forced off: https://github.com/espruino/EspruinoWebIDE/blob/master/js/core/flasher.js#L309
Maybe you could run the version from GitHub and then right-click, inspect element, and view the console - so you can see if anything strange is happening.
To be honest it won't be the end of the world if you just close the Web IDE mid-flashing. The bootloader is designed not to break itself, so you can always re-flash again.