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This section primarily introduces the initialization process of the Contact Form 7 plugin. It defines several constants and functions used to handle form states, validation, and submission operations. These functions encompass state management, API requests, form validation, and error messaging, ensuring a robust form handling mechanism.

Among these, the state management functions are responsible for updating the form's state and triggering corresponding events. The API request functions are used to send requests to the server, retrieving feedback information from the form submission. The form validation functions, on the other hand, are used to verify the validity of the form data and display appropriate error messages, thus ensuring data integrity.

In addition, there are also auxiliary functions, such as those for displaying validation errors and for resetting the form. These functions work together to implement the core functionality of the Contact Form 7 plugin. The code also addresses various browser compatibility issues, ensuring that the plugin operates correctly in different environments, thereby enhancing user experience across platforms.

Finally, the Contact Form 7 plugin is initialized after the document is loaded through a DOMContentLoaded event listener. It first checks whether the browser supports the necessary APIs, then iterates through all Contact Form 7 forms on the page and calls the initialization function. If the necessary API support is lacking, corresponding error messages will be output to the console, alerting developers to potential issues.

In conclusion, this code is a core part of the Contact Form 7 plugin, responsible for handling various form operations and ensuring the plugin operates correctly in different environments. Through modular design and detailed error handling, it guarantees the stability and reliability of the plugin, making it a dependable solution for form management.