<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Class</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
<link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
<link rel="match" href="class-1-ref.html"/>
<meta name="assert" content="Verify that the class attribute affects CSS selectors.">
<style>
  mtext.fail { display: none; }
  mtext.pass { background: green; }
</style>
</head>
<body>

  <p>Test passes if you see 