[css-shadow-parts][css-nesting] is & allowed after ::part() #10788
Description
I don't think it's clear whether the & selector is allowed after the ::part() pseudo-element. At least, I read what I think are the relevant specs and I couldn't find any wording that gives me a clear answer.
For example, is the following CSS:
:hover {
::part(mypart)& {
text-decoration: underline;
}
}equivalent to:
::part(mypart):hover {
text-decoration: underline;
}or is it invalid?