Without trimming, whitespace is preserved:

  Welcome, admin!


With trimming on all tags:Welcome, admin!Trim on if/endif but not content:
  Hello Dash!If-else without trimming:

  Normal view


If-else with full trimming:Normal viewMixed trimming on else-if chain:
StartAdminEnd

Inline if (no newlines):
[yes]

False condition with trimming:
[]