Hello,
I saw something strange in this site https://zinquo.com, in a WebPageTest test we can see 29 resources loaded, and in the DevTools we can see 167 resources
I found a DOMContentLoaded listener as a trigger to load tons of scripts:
The trigger
The method
My question is, why WPT don’t execute the DCL trigger?
This is a fun one! 
So the requests are indeed triggered during DOMContentLoaded
_triggerListener() {
this._removeUserInteractionListener(this),
"loading" === document.readyState ? document.addEventListener("DOMContentLoaded", this._loadEverythingNow.bind(this)) : this._loadEverythingNow()
}
That method, _triggerListener, is only called from userEventHandler:
this.userEventHandler = this._triggerListener.bind(this),
Which is called when any of these events fire:
this.triggerEvents = ["keydown", "mousedown", "mousemove", "touchmove", "touchstart", "touchend", "wheel"],
So WebPageTest never gets those requests, because none of those user interactions fire.
You can trigger them with custom scripting though!
This script navigates to the page, then fires a mousedown event:
navigate https://zinquo.com/
execAndWait window.dispatchEvent(new Event('mousedown'));
The result, is you can see two steps in the test. The first is the initial load, the second is what happens after user interaction.
Full test results here: zinquo.com : Chrome...irginia USA - EC2 - WebPageTest Result
