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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaBrailleLabel MDN</title>
</head>
<body>
  <button id="button" aria-braillelabel="***">3 out of 5 stars</button>
  <pre id="out"></pre>
  <script>
    var button = document.getElementById("button");
    var lines = [];
    lines.push(button.ariaBrailleLabel);
    button.ariaBrailleLabel = "3*";
    lines.push(button.ariaBrailleLabel);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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