Exactly when does an IFRAME onload event fire?

Question

Does the IFRAME\'s onload event fire when the HTML has fully downloaded, or only when all dependent elements load as well? (css/js/img)

Answer 1

The latter: fires only when all dependent elements (css/js/img) have been loaded as well.

If you want to run JavaScript code when the HTML has been loaded, do this at the end of your HTML:

Here is a relevant e-mail thread about the difference between load and ready (jQuery supports both).