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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Test: descriptor prefix</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org/">
<link rel="match" href="descriptor-prefix-ref.html">
<link rel="stylesheet" href="support/test-common.css">
<style type="text/css">
@counter-style a {
system: extends upper-roman;
prefix: "Appendix ";
}
section {
counter-reset: p -3;
}
p {
counter-increment: p;
}
p::before {
content: counter(p, a);
}
</style>
<ol start="-2" style="list-style-type: a">
<li><li><li><li><li>
</ol>
<section>
<p><p><p><p><p>
</section>