Changes

|data5 ={{{population|}}}

For more complex fields with preformatted pre-formated contents that would still be present if a parameter was unset, you can wrap it all in a simple "if" statement to make the whole thing vanish when not used. Example:

|data5 = {{#if: {{{mass|}}} | {{{mass}}} kg}}

|name = {{subst:PAGENAME}}|title = Example of an optional header|header1 = {{#if: {{{item_one|}}}{{{item_two|}}}{{{item_three|}}} | Optional header }}|label2 = Item One|data2 = {{{item_one|}}}|label3 = Item Two|data3 = {{{item_two|}}}|label4 = Item Three|data4 = {{{item_three|}}}

|name =Infobox/doc|bodystyle =|titlestyle =|imagestyle =|captionstyle=|headerstyle =|labelstyle =|datastyle =|belowstyle =

|title =Test Infobox

|image =[[Image:example.png|200px]]|caption =Caption for example.png

|header1 =Header defined alone|label1 =|data1 =

|header2 =|label2 = Label defined alone|data2 =

|header3 =|label3 =|data3 = Data defined alone

|header4 = All three defined (header)|label4 = All three defined (label)|data4 = All three defined (data)

|header5 =|label5 = Label and data defined (label)|data5 = Label and data defined (data)

|below = Below text

|name =Infobox/doc

|title =Test Infobox

|image =[[Image:example.png|200px]]|caption =Caption for example.png

|header1 =Header defined alone|label1 =|data1 =

|header2 =|label2 = Label defined alone|data2 =

|header3 =|label3 =|data3 = Data defined alone

|header4 = All three defined (header)|label4 = All three defined (label)|data4 = All three defined (data)

|header5 =|label5 = Label and data defined (label)|data5 = Label and data defined (data)

|below = Below text

For this example bodystyle=width:20em; and labelstyle= width:33%;

|name =Infobox/doc|bodystyle =width:20em;|titlestyle =|imagestyle =|captionstyle=|headerstyle =|labelstyle = width:33%;|datastyle =|belowstyle =

|title =Test Infobox

|header1 =|label1 = Label 1|data1 = Data 1

|header2 =|label2 = Label 2|data2 = Data 2

|header3 =|label3 = Label 3|data3 = Data 3

|header4 = Header 4|label4 = |data4 =

|header5 =|label5 = Label 5|data5 = Data 5: Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

|below = Below text

|name ={{subst:PAGENAME}}|bodystyle =|titlestyle =|imagestyle =|captionstyle=|headerstyle =|labelstyle =|datastyle =|belowstyle =

|title =

|image =|caption =

|header1 =|label1 =|data1 =

|header2 =|label2 =|data2 =

|header3 =|label3 =|data3 =

|header4 =|label4 =|data4 =

|header5 =|label5 =|data5 =

|header6 =|label6 =|data6 =

|header7 =|label7 =|data7 =

|header8 =|label8 =|data8 =

|header9 =|label9 =|data9 =

|header10 =|label10 =|data10 =

|header11 =|label11 =|data11 =

|header12 =|label12 =|data12 =

|header13 =|label13 =|data13 =

|header14 =|label14 =|data14 =

|header15 =|label15 =|data15 =

|header16 =|label16 =|data16 =

|header17 =|label17 =|data17 =

|header18 =|label18 =|data18 =

|header19 =|label19 =|data19 =

|header20 =|label20 =|data20 =

|below =