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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaBrailleRoleDescription MDN</title>
</head>
<body>
  <article id="article" aria-roledescription="slide" aria-brailleroledescription="sld">
    <h1>Welcome to my talk</h1>
  </article>
  <pre id="out"></pre>
  <script>
    var article = document.getElementById("article");
    var lines = [];
    lines.push(article.ariaBrailleRoleDescription);
    article.ariaBrailleRoleDescription = "sd";
    lines.push(article.ariaBrailleRoleDescription);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaBrailleRoleDescription — MDN get/set (Try It)