How to hang event of the termination of loading the html into a dynamically generated frame?

I create the frame:
var frame = document.createElement("iframe");
frame.src = "https://yandex.ru/";
//frame.contentWindow==null;

I don't need to wait for a full load that frame. Event "frame.onload" waiting for download of ALL data, and it does not suit me.
What event to use???
June 27th 19 at 14:52

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