Difference between window.onload and document.ready

The difference between window.onload and document.ready is as follows.
The ready event occurs after the HTML document has been loaded, while the onload event occurs later, when all content (e.g. images) also has been loaded.
The onload event is a standard event in the DOM, while the ready event is specific to jQuery. The purpose of the ready event is that it should occur as early as possible after the document has loaded, so that code that adds funcionality to the elements in the page doesn't have to wait for all content to load.

Example:
<script>
function myFunction()
{
alert("Javascript Page load");
}
$(document).ready(function() {
    alert("Jquery Page load");
});
</script>
In the example above"Jquery Page load" alert will load first and then "Javascript page load" alert loads.

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