HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selectedStyleSheetSet set</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    if ("selectedStyleSheetSet" in document) {
      var before = document.selectedStyleSheetSet;
      try {
        document.selectedStyleSheetSet = "Some other style sheet";
        document.getElementById("out").textContent =
          "Before: " + before + "\nAfter: " + document.selectedStyleSheetSet;
      } catch (e) {
        document.getElementById("out").textContent = "Error: " + e.message;
      }
    } else {
      document.getElementById("out").textContent =
        "Cannot switch — API not supported";
    }
  </script>
</body>
</html>

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selectedStyleSheetSet — assign new set (Try It)