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Test Info:

<script>
document.addEventListener('DOMContentLoaded', async () => {
let a = new PromiseRejectionEvent('rejectionhandled', {
'promise': new Promise(async (resolve, reject) => {
self.addEventListener('load', () => {
a.visible = false
});
}),
'reason':''
});
SpecialPowers.forceGC();
})
</script>