> > I checked again on browser compatibility:
> > 
> > el6: firefox 38 - ok, google-chrome 27 - no
> > el7: firefox 38 - ok, google-chrome 46 - ok
> > ubuntu: firefox 42 - ok
> > 
> > mac os, windows - we say "latest firefox or google-chrome is required", then - ok
> > 
> > So we are probably okey with using javascript Promises with MIDAS...
> 
> [too bad about chrome on SL6] ... include a polyfill library like Lie (https://github.com/calvinmetcalf/lie).

Results of cross-browser testing.

MacOS 10.10.5:

google-chrome 46: Promise ok, Programs page ok, Overlay ok
firefox 42: Promise ok, Programs page ok, Overlay ok.
safari 9.0.1: Promise ok, Programs page ok, Overlay ok.

Linux SL6.7:

google-chrome 27: "Promise not defined"
firefox 38.4.0: Promise ok, Programs page ok, Overlay ok.
konqueror 4.3.4: no go "Can't find variable: JSON"
chromium/google-chrome 38: ok

Linux SL7.1:

google-crome 46: ok
firefox 38.4.0: ok
konqueror 4.10.5: no go, mhttpd.js parse error

Conclusion:

1) firefox is good everywhere
2) google-chrome is good on Mac, Windows and el7 Linux
3) chromium/google-chrome 38 is good on el6 Linux (SL6/CentOS6).

We are good to proceed with adopting the Promise API for MIDAS.

K.O.