The test verifies that the querySelectorAll() API does not return any matched elements when querying for pseudo-element selectors. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS successfullyParsed is true TEST COMPLETE PASS document.querySelectorAll("div::after").length is 0 PASS document.querySelectorAll("html::before").length is 0 PASS successfullyParsed is true TEST COMPLETE Test for Bugzilla Bug 83446: Broken handling for pseudo-elements in Selectors API.