gecko-dev/layout/reftests/css-import/1373559.html

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HTML

<!doctype html>
<title>CSS test for bug 1373559: Deleted @import rules no longer apply to the document.</title>
<style></style>
Shouldn't be red.
<script>
let sheet = document.styleSheets[0];
sheet.insertRule("@import url(data:text/css,body{color:red})", 0);
document.documentElement.offsetTop;
sheet.deleteRule(0);
</script>