Use window.onload = function{//code} event for this.
<html>
<body>
<iframe width="853" height="480" src="https://www.youtube.com/embed/HexFqifusOk" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
<script>
window.onload = function()
{
alert("Webpage Loaded Completely");
}
</script>
<body>
</html>
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