The sound of WebBrowser and Awesomium?

Question

JavaScript

The question is, is there a program that uses webbrowser or awesomium (in this case, there is no difference), when you open a page, for example youtube where there is a video loading at startup, I cannot perform actions with the page through js. an error appears that the DOM is not yet "ready" until this video (or page) is fully loaded. Accordingly, is it possible to fix this somehow, so that I can, ignoring this loading, perform some actions through js.?
Update: "what is it for"
Consider the example from youtube.com, as soon as the page "opens" in the browser, it starts playing the video automatically, for example, I want to cancel this action by simply clicking on the video element using .click (this is just one of the possible examples) and pausing it, but these 2 browsers (webbrowser and awesomium) do not provide such an opportunity until the video is fully loaded, after reading the documentation for these two components, I did not find anything suitable, maybe someone has experience or is just more attentive and knows how to fix it.

Answer 1

What's the point of doing anything with the page until it's fully loaded?