attribute-selector-recursive-update-on-setAttribute.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="../../resources/js-test.js"></script>
<style>
.entry[status="foo"] .toggle {
    color: green;
}
.entry[status="bar"] .toggle {
    color: red;
}
</style>
</head>
<body>
<div class="entry" status="foo">
    <span class="toggle">Text.</span>
</div>
<script>

description("This test checks that attribute selectors are recursively re-evaluated when the attribute changes.");

var entry= document.getElementsByClassName("entry")[0];
var toggle = document.getElementsByClassName("toggle")[0];

shouldBe("getComputedStyle(toggle).color", "'rgb(0, 128, 0)'");
entry.setAttribute("status", "bar");
shouldBe("getComputedStyle(toggle).color", "'rgb(255, 0, 0)'");

document.body.removeChild(entry);

</script>
</body>
</html>

chromium/third_party/blink/web_tests/fast/css/attribute-selector-recursive-update-on-setAttribute.html