<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Test: descriptor negative, invalid</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org/">
<link rel="help" href="https://drafts.csswg.org/css-counter-styles-3/#counter-style-negative">
<link rel="match" href="descriptor-negative-invalid-ref.html">
<link rel="stylesheet" href="support/test-common.css">
<style type="text/css">
  @counter-style a {
    system: extends decimal;
    negative: '!';
    negative: 0;
    negative: ~;
    negative: '(' 'x' ')';
  }
</style>
<ol start="-2" style="list-style-type: a">
  <li><li><li><li><li>
</ol>
