[Etheryte]

Do note that while modern browsers are pretty performant with this, the more you stack shadows the more your low end users pay for it. I can't recall which large site ran into it a few years ago, but the short gist is they struggled with scroll performance and in the end stacked shadows were to blame.

[Waterluvian]

On this note, is there a way to do CSS profiling other than bisecting it all? Like some way to get the rendering times for each CSS rule or for each element and children?