[html5 (JS)] Audio multitracks issues all browsers

Hi there,
it seems there are some limitations with audio and HTML5.
With Armory, currently the audio on HTML5 is not working on mobile and has some issues regarding multi-tracks playing at the same time.
This can be a problem for a game with audioFX and music background playing at the same time.

Start by reproducing the HTML5 audio failure on mobile and the simultaneous multitrack playback problem across browsers. Compare behavior when a game sound effect and background music play together, and confirm the work is done when both cases work reliably on supported HTML5 targets.

Written by the indexing model from the issue text.