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<!DOCTYPE html>
<html>
<head>
  <base id="myBase" href="https://www.w3schools.com/jsref/">
</head>
<body>
<h3>A demonstration of how to access a BASE element</h3>
<p>Click the button to get the URL of the base element.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myBase").href;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>