"Stacking context" creation is one of those concepts that many coders skip while learning as "intuitive enough not to dive deeper", and then stare in disbelief

"Stacking context" creation is one of those concepts that many coders skip while learning as "intuitive enough not to dive deeper", and then stare in disbelief on list of properties that affects this, as pointed out in https://news.ycombinator.com/item?id=32600047 https://news.ycombinator.com/item?id=32600047 . Who would have thought that `will-change: mask-image` would have similar effect similar to `position: relative`?