a[id=test] {}
a[id="test"] {}
a[id='test'] {}
a[id=func("foo")] {}
a[class="(╯°□°）╯︵ ┻━┻"]{}
input:not([type="radio"]):not([type="checkbox"]) {}
input:not([type="radio"], [type="checkbox"]) {}
section:has(:not([type="radio"], [type="checkbox"])) {}