Surround the text with <code> or <tt> tags (they're synonymous), use HTML line breaks <br/> at the end of lines, and use the HTML code for a non-breaking space   to represent spaces. Both wikitext markup (e.g. apostrophes used for italics/bold) and special HTML characters, like > are interpreted. Recommended for true mono-space requirements.

Please remember that, as wikitext will still be interpreted within the <code> tag, you should check the page output carefully to ensure that nothing has been unintentionally interpreted by the wiki. If anything has, you should surround the appropriate text with a <nowiki> tag.

Wikitext code:

<code>

<span style="color:#008000">\ Simple example illustrating use of monospacing</span><br/>

lll ; &nbsp;&nbsp;&nbsp; an ''italic'' comment &gt; by <span style="color:#0000C0">Blue Person</span><br/>

AAA ; &nbsp;&nbsp;&nbsp; followed by a '''bold''' comment &gt; by <span style="color:#C00000">Red Person</span>

</code>

Output:

\ Simple example illustrating use of monospacing

lll ;     an italic comment > by Blue Person

AAA ;     followed by a bold comment > by Red Person

Use a single space at the start of each line, to pre-format the text, in a separate box. Both wikitext markup (e.g. apostrophes used for italics/bold) and special HTML characters, like > are interpreted. Not true mono-spacing.

Wikitext code:

 <span style="color:#008000">\ Simple example illustrating use of a single space at the start of lines</span>

 lll ;     an ''italic'' comment &gt; by <span style="color:#0000C0">Blue Person</span>

 AAA ;     followed by a '''bold''' comment &gt; by <span style="color:#C00000">Red Person</span>

Output:

\ Simple example illustrating use of a single space at the start of lines

lll ;     an italic comment > by Blue Person

AAA ;     followed by a bold comment > by Red Person

Similar output to using a single space at the start of each line, use the <pre> tag to surround a block of text you want pre-formatted, in a separate box but, unlike using a single-space at the start of each line, wikitext markup (e.g. apostrophes used for italics/bold or span colouring) is not interpreted. Special HTML characters, like > are still interpreted, however. Not true mono-spacing.

Wikitext code:

<pre>

<span style="color:#008000">\ Simple example illustrating use of pre-formatted text</span>

lll ;     an ''italic'' comment &gt; by <span style="color:#0000C0">Blue Person</span>

AAA ;     followed by a '''bold''' comment &gt; by <span style="color:#C00000">Red Person</span>

</pre>

Output:

<span style="color:#008000">\ Simple example illustrating use of pre-formatted text</span>

lll ;     an ''italic'' comment &gt; by <span style="color:#0000C0">Blue Person</span>

AAA ;     followed by a '''bold''' comment &gt; by <span style="color:#C00000">Red Person</span>