<html>
<head>
<style>
div[foo] { background-color: green; }
div[bar] > div { background-color: red; }
div[baz] ~ div { background-color: blue; }
</style>
</head>
<body>
<div id=bar><div>RED</div></div>
<div id=foo>GREEN</div>
<div id=baz></div>
<div>BLUE</div>
<script>
setTimeout(function() {
for (let id of ["foo", "bar", "baz"]) {
let e = document.getElementById(id);
e.setAttribute(id, "");
}
setTimeout(function() {
for (let id of ["foo", "bar", "baz"]) {
let e = document.getElementById(id);
e.removeAttribute(id);
}
}, 1000);
}, 1000);
</script>
</body>
</html>
