Inténtalo tú mismo - JavaScript Reference url

<!DOCTYPE html>
<html>
<body>

<form action="form_action.asp">
  Homepage: <input type="url" id="myURL" name="website" autocomplete="on">
  <input type="submit">
</form>

<p>Click the "Try it" button to set autocomplete in the URL field to "off".</p>

<p><b>Note:</b> If you are new to the autocomplete attribute, fill in a URL, starting with "http://", and submit the form, then reload the page, start to fill in the same values in the URL field again - and see how autocomplete works. Then, click the "Try it" button to set autocomplete to "off" - if you type something in the URL field now, the browser will not suggest values based on values that you have entered before.</p>

<p><strong>Note:</strong> elements with type="url" are not supported in IE 9 (and earlier), or Safari.</p>

</body>
</html>