You are strongly encouraged to customize them in your own stylesheets, but here is the "standard" Parsley css file that is used here on the documentation and examples, if you want to use it to bootstrap your projects with Parsley.
Parsley comes with various error messages for its built-in validators.
Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.
Input validation should be applied on both syntactical and semantic level.
To learn how to craft your custom remote validators, go here.
Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.
For performance reasons, Parsley does not use j Query events, but the API to listen to events is very similar: By default, all 2xx ajax returs are considered valid, all others failure.