Editing Template:Block bug documentation

<noinclude>{{notice|Ignore any errors showing below; they do not appear when this snippet is transcluded (nor does this message box). This doc snippet's output only works when it's transcluded into the context of a specific template, e.g. at [[Template:Block indent/doc]]}}

</noinclude>If the block-formatted content uses a ''named'' parameter (including {{para|1}}) and begins with a list (or any other wikimarkup that is dependent upon a specific markup character being at the beginning of a line), because [[MediaWiki]] behavior is to strip whitespace from named parameters, a {{xtag|nowiki|s}} and a new line must exist before the list (or whatever) starts. This no longer affects ''unnamed'' parameters. Compare:
{| class="wikitable"
|-
! &nbsp;
! scope="col" | code
! scope="col" | result
|-
! scope="row" | Works as intended
|{{tlx|nolink=true|{{BASEPAGENAME}}|<br>*Firstly, ...<br/>*Secondly, ...<br/>*Thirdly, ...<br/>}}
| <includeonly>{{ {{BASEPAGENAME}}|
*Firstly, ...
*Secondly, ...
*Thirdly, ...
}}</includeonly><noinclude>{{error|This output only works when this doc snippet is transcluded.}}</noinclude>
|-
! scope="row" | FAIL
|{{tlx|nolink=true|{{BASEPAGENAME}}|{{nowrap|{{{1|1}}}{{=}}}}<br>*Firstly, ...<br/>*Secondly, ...<br/>*Thirdly, ...<br/>}}
| <includeonly>{{ {{BASEPAGENAME}}|{{{1|1}}}=
*Firstly, ...
*Secondly, ...
*Thirdly, ...
}}</includeonly><noinclude>{{error|This output only works when this doc snippet is transcluded.}}</noinclude>
|-
! scope="row" | Works as intended
|{{tlx|nolink=true|{{BASEPAGENAME}}|{{{1|1}}}{{=}}'''&lt;nowiki /&gt;'''<br/>*Firstly, ...<br/>*Secondly, ...<br/>*Thirdly, ...<br/>}}
| <includeonly>{{ {{BASEPAGENAME}}|{{{1|1}}}=<nowiki />
*Firstly, ...
*Secondly, ...
*Thirdly, ...
}}</includeonly><noinclude>{{error|This output only works when this doc snippet is transcluded.}}</noinclude>
|}
To embed a table in block markup like this, the block template's content parameter must be named or numbered and include the self-closing nowiki – as in <code><nowiki>|1=&lt;nowiki /&gt;</nowiki></code> – then every <code><nowiki>|</nowiki></code> character in the table markup must be escaped with {{magic word|!}}. An alternative is to use explicit HTML {{tag|table|o}}, {{tag|tr|o}}, {{tag|th|o}}, and {{tag|td|o}} markup.<noinclude>
{{Documentation|content=This is transcluded documentation, which can be transcluded in the /doc pages of various templates like {{tlx|Block indent}} and {{tlx|Quote}}, e.g. under a "Technical issue with block templates" heading or the like.  Right now it takes no parameter other than {{para|1|{{var|foo}}}}, to change the <code><nowiki>{{{1}}}</nowiki></code> to something else, thus changing the display (and operation) to use something other than {{para|1}} in the shown template operations.

[[Category:Documentation shared content templates]]
}}
</noinclude>