window.onload vs document.onload

window.onload

• It is fired when the entire page loads, including its content (images, css, scripts, etc.)
• $(window).load()

document.onload

• It is fired when the DOM is ready which can be prior to images and other external content is loaded
• In general, document.onload event is fired before the window.onload
• $(document).ready()

Also Read:

1. Managing the browser navigation history using HTML 5 pushstate and popstate
2. The JavaScript Prototype Property - Visualized
3. position: relative
4. Remove the blank value from a html select option dropdown