Definition of "self-closing" in English

adjective

1. Closing automatically after having been opened.

2. (web development, of an HTML or XML tag) In the form of (for example) {{#tag:syntaxhighlight|

3. In the form of (for example) {{#tag:syntaxhighlight| |inline="True"|lang="html"|style="white-space:pre-wrap;"}} or {{#tag:syntaxhighlight| |inline="True"|lang="html"|style="white-space:pre-wrap;"}}, without containing any content, as opposed to (for example) {{#tag:syntaxhighlight|text|inline="True"|lang="html"|style="white-space:pre-wrap;"}}, which is composed of an opening ({{#tag:syntaxhighlight||inline="True"|lang="html"|style="white-space:pre-wrap;"}}) and a closing ({{#tag:syntaxhighlight||inline="True"|lang="html"|style="white-space:pre-wrap;"}}) tag.