Test insertAdjacentHTML exceptions to make sure they match HTML5 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS div.insertAdjacentHTML('beforeBegin', 'text') threw exception NoModificationAllowedError: The object can not be modified.. PASS div.insertAdjacentHTML('afterEnd', 'text') threw exception NoModificationAllowedError: The object can not be modified.. PASS div.insertAdjacentHTML('FOO', 'text') threw exception SyntaxError: The string did not match the expected pattern.. PASS document.documentElement.insertAdjacentHTML('afterEnd', 'text') threw exception NoModificationAllowedError: The object can not be modified.. PASS successfullyParsed is true TEST COMPLETE