The first opaque computed background colour walking up from element (the
element itself, then its ancestors). Use to give a floating/overlapping
surface a non-see-through backdrop derived from the live DOM. Returns ''
when nothing opaque is found (let the stylesheet decide).
The first opaque computed background colour walking up from
element(the element itself, then its ancestors). Use to give a floating/overlapping surface a non-see-through backdrop derived from the live DOM. Returns''when nothing opaque is found (let the stylesheet decide).