Some sequences of macros such as l from lists and tr from tables automatically generate implicit parents, e.g.:
\Ul[
\L[aa]
\L[bb]
]
parses exactly like:
\L[aa]
\L[bb]
The children are always added as arguments of the content argument of the implicit parent.
If present, the auto_parent macro property determines which auto-parent gets added to those macros.

Ancestors