ughh..... Again, they wrap it because they use something like Crosswalk. There is no such thing for the 3DS. More than a plugin, a lot more, is needed. You seem to think this is much simpler than it is.
Never said it would be easy easy i could manage
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Based on Wikipedia.
An improved version of the browser is included on the New Nintendo 3DS console, which includes the ability to play HTML5-based videos in both 2D and 3D, courtesy of the system's improved CPU performance. The New Nintendo 3DS and its XL variant can also handle higher video quality thanks to the faster GPU and video decoding chip. The new browser also renders pages much faster.
You might be able to run your construct game out of the browser but honestly there are no real use as the game is stored on the web.
If you have a WiiU however, you can create 'official channel' out of your html5/javascript projects. I created some personal wrapper for sites such as tasvideo to watch it on my WiiU.
I also created a small interface to watch video and listen to audio out of my NAS.
Hum i need to hack my Wii u then....