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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Objects</h1>
<h2>The Object.seal() Method</h2>
<p id="demo"></p>
<script>
  const fruits = [& quot; Banana & quot;, & quot; Orange & quot;, & quot; Apple & quot;, & quot; Mango & quot;];
  Object.seal(fruits);
  // Test Error
  let text = "";
  try {
    fruits.push("Kiwi");
  }
  catch (err) {
    text = err;
  }
  document.getElementById("demo").innerHTML = text;
</script>
</body>
<!-- /jsref/tryit.asp?filename=tryjsref_object_seal 
</html>