LayoutTests/fast/selectors/pseudo-element-in-is-where.html

<!doctyle html>
<style>
:is(.test1) { color:green; background-color: red; }
:is(.test1, .test1::before) { background-color:white; }
:is(.test2)::before { color:green; content:'Test that a pseudo element is ignored in :is()'; }
:is(.test2::before) { background-color:red; }
:where(.test3) { color:green; background-color: red; }
:where(.test3, .test3::before) { background-color:white; }
:where(.test4)::before { color:green; content:'Test that a pseudo element is ignored in :where()'; }
:where(.test4::before) { background-color:red; }
</style>
<div class=test1>Test that a pseudo element is ignored in :is()</div>
<div class=test2></div>
<div class=test3>Test that a pseudo element is ignored in :where()</div>
<div class=test4></div>