site identity section name?

The “Site Identity” section has the ID of title_tagline for historical reasons.

If you want to see the IDs for the core sections, all you have to do is look at the source for WP_Customize_Manager::register_controls(). Alternatively, you can get a list of all the sections registered, whether by core or by plugins, by opening your console and entering: _.keys( wp.customize.settings.sections ).

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