onload event
The onload event occurs when an object has been loaded.
Usually, this is used within the <body> elements to execute a script once a web page has completely loaded all content (including images, script files, CSS files, etc.).
Systnax
In HTML:
<element onload="myScript">
In JavaScript:
object.onload = function(){myScript};
In JavaScript, using the addEventListener() method:
object.addEventlistener("Load", myScript);
In JavaScript example:
<!DOCTYPE html>
<html>
<body>
<p>This example uses the HTML DOM to assign an "onload" event to an iframe element.</p>
<iframe id="myFrame" src="/default.asp"></iframe>
<p id="demo"></p>
<script>
document.getElementById("myFrame").onload = function() {myFunction()};
function myFunction() {
document.getElementById("demo").innerHTML = "Iframe is loaded.";
}
</script>
</body>
</html>
https://www.w3schools.com/jsref/event_onload.asp
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