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Test Info:

<!DOCTYPE html>
<html>
<style>
@keyframes test {
0% {
}
}
</style>
<script>
var sheet = document.styleSheets[0];
var rule = sheet.cssRules[0];
var keyframe = rule.cssRules[0];
rule.deleteRule("0%");
sheet.deleteRule(0);
rule = null;
SpecialPowers.forceGC();
SpecialPowers.forceCC();
keyframe.parentRule;
</script>