It seams like UE4 embeded in HTML5 binds all keyboard keys, because I can’t type in any inputs and when pressing F5 UE4 logs:
[2015.07.28-14.00.34:366][791]Set new viewmode: ShaderComplexity
[2015.07.28-14.00.34:368][791]Debug viewmodes not allowed on consoles by default. See AllowDebugViewmodes().
Any ideas?