List of HTML Self-Closing Tags
Here is a complete list of self-closing tags for HTML5. These are called “void-elements” in HTML spec.
The space before the slash is optional.
Is the Ending Slash Optional?
- HTML5: the slash is optional.
- HTML4: the slash is technically invalid. However, it's accepted by W3C's HTML validator.
- XHTML: The slash is REQUIRED.
I recommend to always add the slash. Because, it provides a visual clue of non-closing tags.
XHTML Supports Self-Closing Syntax for All Tags
In XML/XHTML, any tag can be self-closed by the ending slash
When you test XML, you have to make sure the server is sending the correct
[ Internet media type ] [ https://en.wikipedia.org/wiki/Internet_media_type ] as XHTML (for example,
application/xhtml+xml), otherwise browsers will treat it as HTML, regardless of the DOCTYPE in your file.