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