In HTML, certain elements such as <ul> cannot have any text nodes in them, and any whitespace is ignored, see stackoverflow.com/questions/2161337/can-we-use-any-other-tag-inside-ul-along-with-li/60885802#60885802.
A similar concept applies to OurBigBook, e.g.:
\Ul[
\L[aa]
\L[bb]
]
does not parse as:
\Ul[\L[aa]<NEWLINE>\L[bb]<NEWLINE>]
but rather as:
\Ul[\L[aa]\L[bb]]
because the content argument of ul is marked with remove_whitespace_children and automatically removes any whitespace children (such as a newline) as a result.
This also applies to consecutive sequences of auto_parent macro property macros, e.g.:
\L[aa]
\L[bb]
also does not include the newline between the list items.
The definition of whitespace is the same as the ASCII whitespace definition of HTML5: \r\n\f\t.

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