Basic longlink use
{{Longlink|[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]}}
Side by side comparison
{{Longlink}}{{Longlink/sandbox}}
<div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; ">[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]</div>
Category:Categories that have been created to describe their contents using an unusually long name for some reason
<span style="padding:0.2em 0.4em; line-height:1.2em; ">[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]</span>
Longlink with style param
{{Longlink|[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]|style=background-color:#aaffaa;}}
Side by side comparison
{{Longlink}}{{Longlink/sandbox}}
<div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; background-color:#aaffaa;">[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]</div>
Category:Categories that have been created to describe their contents using an unusually long name for some reason
<span style="padding:0.2em 0.4em; line-height:1.2em; background-color:#aaffaa;">[[:Category:Categories that have been created to describe their contents using an unusually long name for some reason]]</span>