<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<style id=s>
body[foo] [id=d] { color: green };
</style>
<body>
<div id=d>PASS</div>
<script>
d.offsetLeft;
s.sheet.cssRules.item(0).selectorText = "body[foo]";
document.body.setAttribute("foo", "foo");
</script>