Customizer JS API: Defining control settings

Settings must be registered in PHP one way or another. If you don’t register them statically via $wp_customize->add_setting() calls, you will have to register dynamic recognition of them via the customize_dynamic_setting_args filter. Why? In order for a setting to be safely stored it must be sanitized and validated by the server. Relying on client-side sanitization and validation is dangerous. Additionally, the Customizer setting is what gets persisted into the DB and actually applies a change to the site. This means that WordPress needs to know what a setting is for, how to preview it, and how to save it. So you may freely create settings in JS, but you must create a
customize_dynamic_setting_args filter. You use this filter to match a given setting ID against a certain pattern you define. Examples of this can be found in core for widgets and nav menu items.

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