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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clearAppBadge — zero</title>
</head>
<body>
  <pre id="out">Working…</pre>
  <script>
    async function compareClearStyles() {
      if (!navigator.clearAppBadge || !navigator.setAppBadge) {
        return "Badging API not supported";
      }
      await navigator.clearAppBadge();
      await navigator.setAppBadge(0);
      return "Both clearAppBadge() and setAppBadge(0) clear the badge";
    }
    compareClearStyles().then(
      function (msg) {
        document.getElementById("out").textContent = msg;
      },
      function (err) {
        document.getElementById("out").textContent = "Error: " + err.name;
      }
    );
  </script>
</body>
</html>

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clearAppBadge — vs setAppBadge(0) (Try It)