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<html><head>
  <meta charset="utf-8">
  <title>Reference: content:none on a :root block</title>
  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1699964">
<style>
html,body {
  padding:0; margin:0;
}
</style>
</head>
<body><span>B</span><span>A</span></body>
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