User:Alogrin/Template:Test

Here is a text of template:

# {{{Domain|{{{Lang}}}}}} <br />
# {{#if: {{{Domain|}}} | {{{Domain|}}} |{{{Lang}}} }}<br />
# {{{1|}}}<br />

A) {{User:Alogrin/Template:Test|Lang=english| Domain= }}
This one doesn’t work with a passing of an «empty» Domain to {{{Domain|{{{Lang}}}}}}. But #if: — works.

1. 
   
2. english
   
3. 
   

B) {{User:Alogrin/Template:Test|Lang=english| Domain}}
This works, though only because «Domain» is treated as a string.

1. english
   
2. english
   
3. Domain
   

C) {{User:Alogrin/Template:Test|Lang=english| Domain{{#if: |=Domain-value}}}}
Works, as in (B)

1. english
   
2. english
   
3. Domain
   

D) {{User:Alogrin/Template:Test|Lang=english| Domain{{#if: yes |=Domain-value}}}}
Works, as in (B) — the whole section is treated, as a single string parameter

1. english
   
2. english
   
3. Domain =Domain-value
   

E) {{User:Alogrin/Template:Test|Lang=english| Domain={{#if: | Domain-value}}}}
Works as in (A)

1. 
   
2. english
   
3. 
   

F) {{User:Alogrin/Template:Test|Lang=english| Domain={{#if: yes | Domain-value}}}}
This one is a desirable result — {{{Domain|{{{Lang}}}}}} works in sync with #if:

1. Domain-value
   
2. Domain-value
   
3. 
   

G) {{User:Alogrin/Template:Test|Lang=english| {{#if: | Domain=Domain-value}}}}
Works, as in (B) — the whole section is treated, as a single string parameter

1. english
   
2. english
   
3. 
   

H) {{User:Alogrin/Template:Test|Lang=english| {{#if: yes | Domain=Domain-value}}}}
Works, as in (B) — the whole section is treated, as a single string parameter

1. english
   
2. english
   
3. Domain=Domain-value