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<html><body><h1>The Window Object</h1><h2>The atob() Method</h2><p>The atob() method decodes a base-64 encoded string.</p><p>The atob() method is not supported in IE9 and earlier.</p><p id="demo"></p><script>let text = "Hello World!";let encoded = window.btoa(text);let decoded = window.atob(encoded);document.getElementById("demo").innerHTML = "Encoded: " + encoded + "<br>" + "Decoded: " + decoded;</script></body></html>