Equivalent of "element.scrollHeight" for "window" in Javascript?

Question

What's the equivalent to element.scrollHeight for window in plain vanilla Javascript? I'm trying to rewrite code to target window or document instead of the element?

Converting this: remaining = element.scrollHeight - (element.clientHeight + element.scrollTop);

Into this: remaining = window.scrollHeight - (window.innerHeight + window.pageYOffset);

Answer 1

document.documentElement.scrollHeight