I have heard of some really weird restrictions from html5 publishers, and once again, it is more a matter of "we want things working our exact way or go away, iphone 4 with safari and stock browser of android with fullscreen support and audio working perfectly even though there are mostly only hacks for that in this situations, source code, eventually our sdk, and that for a attractive price, as for the quality of the game, it is only secondary, since we still want outdated devices to work anyway".
I continue to think they will have to change their mind one day, it is not a viable solution, they are restricting the Html5 (wanting something to work with those conditions implies hacks and lower quality, which is abnormal, it is like they want html5 to work on their target, while html5 is designed to be done one way, with the browsers being compatible with it, and also the outdated devices will never be corrected, and they know it pretty well).