This special page takes text and expands all templates in it recursively. It also expands supported parser functions like {{#language:…}} and variables like {{CURRENTDAY}}. In fact, it expands pretty much everything in double-braces.
{{#language:…}}
{{CURRENTDAY}}
Context title, for {{FULLPAGENAME}}, etc.:
Input text:
Remove comments
Suppress <nowiki> tags in result
Show XML parse tree
Show raw HTML