do_action( ‘start_previewing_theme’, WP_Customize_Manager $manager )

Fires once the Customizer theme preview has started.

Parameters

do_action( 'start_previewing_theme', $this );

Used by	Description
WP_Customize_Manager::start_previewing_theme()`wp-includes/class-wp-customize-manager.php`	If the theme to be previewed isn’t the active theme, add filter callbacks to swap it out at runtime.

Version	Description
3.4.0	Introduced.

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