<!doctype html> <title>Element class test</title> <div class="a b c">Fail</div> <script src=asserts.js></script> <script> const div = document.getElementsByClassName("a")[0] const classes = ["a", "b", "c"]; let cl = div.classList; for (let i = 0; i < classes.length; ++i) assert_equals(cl[i], classes[i]); const classes2 = ["x", "y", "z"]; div.setAttribute("class", classes2.join(' ')); let i = 0; for (let x of cl) assert_equals(x, classes2[i++]); div.textContent = "Success"; </script>