The test verifies functionality of protocol method CSS.getMatchedStylesForNode for nested groups.
There shouldn't be an empty rule for #no-properties
Dumping inline style: 
{
}
Dumping matched rules: 
*#no-properties* {    regular
}
@supports (display: flex)
    *&* {    regular
        color: red; @[4:8-4:19]
        color: red; @[undefined-undefined]
    }
Dumping inherited rules: 

There should be a rule for implicit nested group.
Dumping inline style: 
{
}
Dumping matched rules: 
*#with-properties* {    regular
}
@supports (display: flex)
     {    regular
        color: blue; @[11:6-11:18]
        color: blue; @[undefined-undefined]
    }
@supports (display: flex)
    *&* {    regular
        color: red; @[13:8-13:19]
        color: red; @[undefined-undefined]
    }
Dumping inherited rules: 

There should be a (ghost) rule for #commented-out-property.
Dumping inline style: 
{
}
Dumping matched rules: 
*#commented-out-property* {    regular
}
@supports (display: flex)
     {    regular
        color: red; @[20:6-20:23]
    }
Dumping inherited rules: