I found a script that might be useful for people who post WiPs and want to help their beta-testers report bugs, typos, or even comments and suggestions from right inside the game.
It’s called Orphus and can be downloaded from here: http://orphus.ru/en/
Then follow the instructions to install it in your WiP.
IMPORTANT: In step 5, the code must be installed in the body (not the HTML file’s header). It only has to be put in your game’s index.html file.