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. Making max width work in internet explorer
3. box-sizing
4. Testing promise sequence using mocha, chai, chai-as-promised, sinon
5. Split a string in javascript when both comma and spaces are present