The `\Toplevel` implicit macro

Every OurBigBook document is implicitly put inside a \Toplevel document and:

any optionally given arguments at the very beginning of the document will be treated as arguments of the \Toplevel macro
anything else will be put inside the content argument of the \Toplevel macro

E.g., a OurBigBook document that contains:

{title=My favorite title}

And now, some content!

is morally equivalent to:

\Toplevel{title=My favorite title}
[
And now, some content!
]

In terms of HTML, the \Toplevel element corresponds to the <html>, <head>, <header> and <footer> elements of a document.

Trying to use the \Toplevel macro explicitly in a document leads to an error.

 Ancestors (3)