What is the issue with the HTML Standard?

https://html.spec.whatwg.org/multipage/iframe-embed-object.html#iframe-load-event-steps

Step 4.1.3 says:

Mark resource timing given fallbackTimingInfo, url, "iframe", global, the empty string, a new response body info, and 0.

But url is not defined anywhere and is not an argument of the algorithm.