[seba_dos1]

I'd assume that it was actually an invisible, but not technically hidden div, leading to a fully transparent blending pass - divs with opacity:0 or display:none are trivial to optimize for this case.

[magicalist]

> I'd assume that it was actually an invisible, but not technically hidden div

Considering that it's now optimized and that's not what the original post said, I don't know why you'd assume that.