to be exact, the following features are not supported:
"The following features are not supported in CocoonJS. If any of them are used, Construct 2 will print a message to the debug log saying that they are not supported.
- The form control plugins Textbox and Button are not supported.
- The XML object is not supported.
- The Facebook object is not supported.
- The letterbox fullscreen modes are not supported. If they are selected, it will fall back to 'Scale outer' mode instead.
- The Text plugin's 'Set web font' action is not supported.
- The WebStorage plugin's session storage is not available. Use local storage or global variables instead."
WHAT NOO!!!! please dont say that the webstorage plugin isn't working!!!!! do you you know how many days i waisted just to add that feature in my game!!!!! F**K COONCOON