Thanks for the help Paul. I have sandboxed all the GWT generated files.
"sandbox": {
"pages": ["LocalWebApp.html",
"localwebapp/1BB99A3D08C87C45637BBB49C33972DD.cache.html",
"localwebapp/224DB061DE2E651F5E214936A979AAF1.cache.html",
"localwebapp/76F2766D4527FFDD118CC749CEFB9C73.cache.html",
"localwebapp/EB53C46D3172A1A03E5343FBAFCC31F5.cache.html",
"localwebapp/F835CA016A98AA5A6E4A7BE26497B885.cache.html",
"localwebapp/FA0F6F702D3923A937014A27583C7536.cache.html",
"localwebapp/localwebapp.nocache.js"
]
I am still getting errors. These are different from what I was getting. As I understand this has to do with XSS but all my files are local and I am not accessing any external site.
Uncaught document.write() is not available in packaged apps. platformApp:12