It's sandbox, not a real user page.
Math formula
An example of math formula:
Template test
Old text from the MainPage
MediaWiki has been successfully installed.
Consult the User's Guide for information on using the wiki software.
Testing pre tag
one two it is very very long line fgdfssksejdgkjsndfkbwejhbwekjrhbvjlehrb jkrebfkjhsebvkjuhwbevrjkberjvbkjwervbjkwehrfvjhwebjkvhbewrjkvhb ewrfjhbwerjfh bwjerbhf jheb fjhewbr fjhbwer fjhbewr fjkbhew rf very very very long line it is
Update
Update passed!
Footnote
This is big [1].