Style added by JS is lost after animation

[pfedan]

When I add a custom style to an element with JS like
node.style.transform = "rotate(" + (Math.floor(Math.random() * 20) - 10).toString() + "deg)";
and then do an action that animates the grid, the previous rotation is lost.

I guess this is due to the fact, that the animation mechanism uses transform for itself and just overwrites everything that was there before.

Is it possible to keep all previously defined styles and only add the transforms for the animation of the grid?