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{{Documentation subpage}}
{{Always substitute}}
{{Template shortcut|hcmt}}
{{Distinguish|text={{tl|Example HTML comment}}}}

Use this [[Wikipedia:Substitution|substitution]] to insert HTML comments (<syntaxhighlight lang="html" inline></syntaxhighlight>) – hidden to readers – into Wikipedia pages.

== Usage ==
: <syntaxhighlight lang="wikitext" inline>{{subst:html comment|Lorem ipsum dolor sit amet}}</syntaxhighlight>
:: ↳ <syntaxhighlight lang="html" inline></syntaxhighlight>

By default a space will be added before and after the given text. Use {{para|collapsed|yes}} to remove it (useful in vertical comments). For example,

<syntaxhighlight lang="wikitext">{{subst:html comment|collapsed=yes|

Lorem ipsum dolor sit amet

}}</syntaxhighlight>

will generate

<syntaxhighlight lang="wikitext"></syntaxhighlight>

In substitutable templates, use <syntaxhighlight lang="wikitext" inline>{{safesubst:<noinclude />HTML comment|...}}</syntaxhighlight>.

== Notable cases ==
Using this substitution allows the expansion of [[:mw:Help:Magic words|MediaWiki commands]] inside HTML comments, where they would be preserved verbatim otherwise. Compare:

: <syntaxhighlight lang="wikitext" inline>{{subst:html comment|{{subst:FULLPAGENAME}}}}</syntaxhighlight>
:: ↳ <syntaxhighlight lang="html" inline></syntaxhighlight>

and:

: <syntaxhighlight lang="wikitext" inline></syntaxhighlight>
:: ↳ <syntaxhighlight lang="html" inline></syntaxhighlight>

== See also ==
* {{Tl|Example HTML comment}}
* {{Tl|Comment}}

<includeonly>{{Sandbox other||

[[Category:HTML typing-aid templates]]
[[Category:Wikitext typing-aid templates]]
[[Category:Hiding templates]]
}}</includeonly>

Template:HTML comment/doc - Revision history

imported>HouseBlaster: deleted at RFD