UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.89 Safari/537.36

Example URL:

Steps to reproduce the problem:
Spec here: https://www.w3.org/TR/progress-events/

Specifically I would love to use loadstart and loadend for img and script elements to monitor page load progress. There are also other cases in the spec.

All elements in Chrome seem to have an onloadstart property, but it's never invoked. onloadend doesn't even exist. addEventListener('loadstart'/'loadend') is never triggered either.

What is the expected behavior?

What went wrong?
Chrome doesn't fire these events.

Did this work before? N/A 

Chrome version: 53.0.2785.89  Channel: stable
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 23.0 r0