This test makes sure that querySelector with pseudo-element inside functional pseudo class :-webkit-any doesn't match anything. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS document.querySelectorAll("#test :-webkit-any(p)").length is 1 PASS document.querySelector("#test :-webkit-any(p)") is target PASS document.querySelectorAll("#test :-webkit-any(p.ng)").length is 1 PASS document.querySelector("#test :-webkit-any(p.ng)") is target PASS document.querySelectorAll("#test div :-webkit-any(p)").length is 1 PASS document.querySelector("#test div :-webkit-any(p)") is target PASS document.querySelectorAll("#test div :-webkit-any(p.ng)").length is 1 PASS document.querySelector("#test div :-webkit-any(p.ng)") is target PASS document.querySelectorAll("#test :-webkit-any(p:first-line)").length is 0 PASS document.querySelector("#test :-webkit-any(p:first-line)") is null PASS document.querySelectorAll("#test :-webkit-any(div:first-line) p").length is 0 PASS document.querySelector("#test :-webkit-any(div:first-line) p") is null PASS document.querySelectorAll("#test :-webkit-any(div:first-line) p.ng").length is 0 PASS document.querySelector("#test :-webkit-any(div:first-line) p.ng") is null PASS successfullyParsed is true TEST COMPLETE