Studying use of 'template' option in templates

If {{User:MobilePhoneMastBot/DRDFormat}} is

{{{suburb|Havercroft}}};{{{mast_status}}};{{{user}}}##

then

{{User:DangerReport/Heckworthy Towers|template=User:MobilePhoneMastBot/DRDFormat|suburb=Santlerville}}

produces

Santlerville;active;Specialfxlady (talk) 02:25, 3 May 2024 (UTC)##

{{User:DangerReport/Heckworthy Towers}}

produces

(77,25) (mpm-ic) (update)
(mast statuses) (statuses)

Heckworthy Towers
"... lights are on in the Heckworty Towers ..."

Specialfxlady (talk) 02:25, 3 May 2024 (UTC)

At this editing, the key portion of [[User:DangerReport/Heckworthy Towers]] is:

|mast_status=unknown
|status=safe
|comment=Powered, and operating a radio.
|user={{User:The_Rooster/Sig}} 15:18, 24 May 2009 (BST)

So, playing with [], which is currently:

{| style="width:7px; height:7px; background:{{StatusMap {{{status|unknown}}}}}" | <!-- Hah! Nothing in the box! -->
|}

In which case

{{User:DangerReport/Heckworthy Towers|template=User:Lariat2301/SandBox3}}

produces

Studying ifdef and ifndef

1: {{{test1Result}}}

2:

ifdef:
1: {{{test1test{{{test1test|}}}|{{{test1Result}}}}}}

ifndef:
2: {{{test2Result{{{test2test|}}}|}}}