just updated to the develop version with the modification.
The problem re-appeared: It is still overriding the body style.
I searched a bit and found out that the new code, works (ie does not overide body custom style) only for inline styles not styles in a css.
After a bit of research I found out that we must use : computedStyle.
to acces the style, looks like we must use something like that: (tried it works in Chrome and FireFox)
var body = document.getElementsByTagName(“body”);
var style = window.getComputedStyle(body, null);