Chrome is the dominant browsers, for Win 7/8, so its the goto browser for testing for most of us. This isn't a C2 problem but... it is a C2 problem in the end, because we rely on these end tools to export.
HTML5 is designed for the web, fine, we get that, but this situation is critical because the web (Chrome & Firefox being the bulk) currently is broken for HTML5 games.
So atm, here's the export options:
Chrome Store = can't use WebStorage, no functional IAP system. /seppuku
Firefox Market = forget about it, performance is horrendous and stutters like mad.
Direct HTML5 for browsers = If they are on recent Chrome or Firefox, its unplayable due to stutters.
Android = wrappers rely on Chromium, its also affected by the stutter bug. Crosswalk is also plagued with security flaws that flag your app to be removed by Google. You just hope players don't mind the stutters. Maybe its on mobiles so they aren't as hardcore as PC gamers are about such things... :/
iOS = CJS WebView+ which uses WKWebView, great when it works, but its got a major flaw of losing save data to iOS8's auto-clean process when devices run low on storage. O_o
Finally, direct PC/MAC/Linux export: Use an older NW else risk the stutters. Sadly Linux is still broken due to NW not updating library dependency. Looks like PC/MAC with NW 10.5 is the only viable option, even-though its not optimal (Steam Overlay, Cloud Save?)..