/* SHORT SELECTOR, EMPTY CONTENT */
a {
}

/* COMPLEX SELECTOR */
div div > div#id.foo.bar:hover .something > .child ~ .sibling + .sibling:after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + .sibling:after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + .sibling::after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + .sibling::after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + :matches(.sibling):after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + :matches(.sibling):after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + :matches(.sibling)::after {
    color: red;
}

div div > div#id.foo.bar:hover .something > .child ~ .sibling + :matches(.sibling)::after {
    color: red;
}