Why not use Javascript handlers on the body element?

Question

As an answer to the question of \'How do you automatically set the focus to a textbox when a web page loads?\', Espo suggests using

Answer 1

Well, '' is an invalid id value if you ask me. I wouldn't use any characters like this.

And for good practice, it's better to use window.onload IMO and place it in the tag. OR Better yet, you can move it to a .js file and cache it for speed.