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<!DOCTYPE html>
<html>
<body>
<form action="/action_page.php">
  Homepage: <input type="url" id="myURL" name="website">
  <input type="submit">
</form>
<p>Click the "Try it" button to set the required property for the URL field.</p>
<p><strong>Tip:</strong> Click the "Submit" button before and after you have clicked the "Try it" button, to see the effect.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  document.getElementById("myURL").required = true;
  document.getElementById("demo").innerHTML = "The required property was set. The URL field must now be filled out before submitting the form.";
}
</script>
</body>
</html>