Worst-case scenario: the UEd Goblin wipes the map and burns down your house.
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Enter text and press "Save" to create it. Press "Cancel" to abort editing without saving the page.
Please don't create new pages just for the sake of testing whether it works. It does, and it just leaves the admins with the task of having to clean up after you.
If you want to make test edits and play with the markup, go to the Sandbox page instead.