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Test Info:

<!doctype html>
<style>
x { }
</style>
<script>
var sheet = document.styleSheets[0];
var rule = sheet.cssRules[0];
var decl = rule.style;
rule.expando = 5;
decl.expando = 6;
sheet.deleteRule(0);
rule = decl = null;
SpecialPowers.forceGC();
SpecialPowers.forceCC();
SpecialPowers.forceGC();
</script>