Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Functions can be invoked automatically without being called:</p>

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

<script>
(function () {
document.getElementById("demo").innerHTML = "Hello! I called myself";
})();
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p>Functions can be invoked automatically without being called:</p>

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

<script>
(function () {
    document.getElementById("demo").innerHTML = "Hello! I called myself";
})();
</script>

</body>
</html>