Define unlimited custom shortcodes from the admin with three call forms: [tag], [tag attr="value"], and [tag]wrapped content[/tag]
Works in both the Markdown and HTML editors, with nested shortcodes and a clean in-form guide on how to use it
Security built in: attribute values are HTML-escaped, URL attributes (href/src/etc.) are limited to safe schemes (javascript:, data:, vbscript: are stripped), and the admin form warns about risky templates