a::after {}

dialog::backdrop {}

a::before {}

video::cue {}
video::cue(b) {}

video::cue-region {}
video::cue-region(#scroll > .div) {}

::grammar-error {}

::marker {}

tabbed-custom-element::part(tab) {}

::placeholder {}

::selection {}

::slotted(*) {}
::slotted(span) {}

::spelling-error {}

::target-text {}

.form-range::-webkit-slider-thumb {}

a::bEfOrE {}

a, b > .foo::before {}
