How come the difference between 'View page source' and document.querySelector("html").innerHTML?

I want to extract subtitles from this YouTube page (link).
I found timedtext, when looking via 'View page source'.

But not when I search via javascript console. It won't find it:

document.querySelector("html").innerHTML.match("timedtext")

But for this other YouTube page, it does actually work both.

How come the difference and how to fix it?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/ajEu7kn

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