Comment Validation

This plugin will allow you to check your pages/posts HTML against the W3C Validator.

Contact Form 7 Email Validation plugin adds an extended validation to verify domain in email address for email fields of Contact Form 7 plugin.

This plugin adds an awesome feature that provides instant feedback and guidance in each field, helps prevent errors.

Added mail validation function to Contact Form 7. Protected by rejection filter, RFC filter, and DNS filter.

The Validated Field add-on for Advanced Custom Fields provides input masking and server-side validation of other field types.

This plugin allows you to create AJAX applications by simple way. It implements JSON data transfer, data escaping, error handling.