I am exporting to NW.js. its not an HTML project.
Just tried it as a web export. the Chrome console says:
Document was loaded from Application Cache with manifest http://www.mailtree.co.uk/temp/offline.appcache
(index):1 Application Cache Checking event
(index):118 Uncaught (in promise) DOMException: Only secure origins are allowed. http://goo.gl/lq4gCo {message: "Only secure origins are allowed. http://goo.gl/lq4gCo", name: "NotSupportedError", code: 9, INDEX_SIZE_ERR: 1, DOMSTRING_SIZE_ERR: 2…}(anonymous function) (index):118
(index):1 Application Cache NoUpdate event
c2runtime.js:94 Uncaught (in promise) DOMException: A call to lockOrientation() or unlockOrientation() canceled this call. {message: "A call to lockOrientation() or unlockOrientation() canceled this call.", name: "AbortError", code: 20, INDEX_SIZE_ERR: 1, DOMSTRING_SIZE_ERR: 2…}l.qr c2runtime.js:94l.xv c2runtime.js:89l.Uj c2runtime.js:103l.Cw.Cg.a.onload c2runtime.js:81
www.mailtree.co.uk/:1 Uncaught (in promise) DOMException: lockOrientation() is not available on this device. {message: "lockOrientation() is not available on this device.", name: "NotSupportedError", code: 9, INDEX_SIZE_ERR: 1, DOMSTRING_SIZE_ERR: 2…}
c2runtime.js:408 Uncaught ReferenceError: tri is not defined
No idea what any of that means or if its relevent. <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">