Mirror

Maps the input to the output, while mapping the string with a custom function (in this case for example for a permalink by replacing spaces and a couple of special characters, àâéèêëïîôûùçäöüß). When the mirrored input is changed by hand the mirroring stops.
Title:
Permalink:

The InputMirror is here used to create a real simple countdown of remaining characters displayed in another input.

Matcher

Only allows values that match a function or regexp, /^[a-z]*$/ is used here, allowing only lowercase characters.
Input:

Tags

Just type in space seperated tags. Tags can be removed by clicking.