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. Why use javascript strict mode
2. gzip compress and cache api response in express
3. Getting started with es6 iterators and iterables
4. Getting started with localStorage vs sessionStorage in html5
5. Progressive enhancement vs Graceful degradation