Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p><a id="myAnchor" hreflang="en-us" href="../index.html">W3Schools</a></p>

<p>Click the button to change the value of the hreflang attribute of the link to "fr".</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    document.getElementById("myAnchor").hreflang = "fr";
    document.getElementById("demo").innerHTML = "The hreflang value of the link was changed from 'en-us' to 'fr'.";
}
</script>

</body>
</html>