Originally Posted by freedom_razor
I think ''don't rely on it'' is more about the use of scripting with the event, and scripts can be just turned off, so you can't rely on them.
As for indicating when a page has finished loading, I reckon ONLOAD is fairly reliable
With hindsight it would have been possible to give a better answer if the OP had indicated what he wished to achieve. Progress bar, start an animation, identify whether people abandon the page before it has finished loading due to impatience, or what?
I (perhaps wrongly) supposed that he wanted a progess bar which would turn off as soon as the page had finished loading. Which AFAIK cannot be done.