Template:HTML comment

Use this substitution to insert HTML comments (<!-- ... -->) – hidden to readers – into Wikipedia pages.

{{subst:html comment|Lorem ipsum dolor sit amet}}

↳ <!-- Lorem ipsum dolor sit amet -->

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

{{subst:html comment|collapsed=yes|
Lorem ipsum dolor sit amet
}}

will generate

<!--


Lorem ipsum dolor sit amet


-->

In substitutable templates, use {{safesubst:<noinclude />HTML comment|...}}.

Using this substitution allows the expansion of MediaWiki commands inside HTML comments, where they would be preserved verbatim otherwise. Compare:

{{subst:html comment|{{subst:FULLPAGENAME}}}}

↳ <!-- Template:HTML comment -->

and:

<!-- {{subst:FULLPAGENAME}} -->

↳ <!-- {{subst:FULLPAGENAME}} -->

• {{Example HTML comment}}
• {{Comment}}