The plugin uses the Based on the Low-Budget Password Strength Estimator
Evaluation of your password is done on the client; it is never transmitted anywhere else.
There is an onload dynamic action on this page that runs the plugin and binds to the item P1_PASSWORD and shows an evaluation of the password strength on the page.
The plugin can bind to a single item, or to all items with a jquery selector (e.g. those marked with a particular class).
Refer to https://github.com/jeffreykemp/jk64-plugin-passwordstrength