gecko-dev/layout/style/crashtests/1533783.html

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HTML

<script>
function start() {
const style = document.createElement('style')
document.head.appendChild(style)
const sheet_1 = style.sheet
document.head.appendChild(style)
sheet_1.insertRule('@import url()', 0)
}
document.addEventListener('DOMContentLoaded', start)
</script>