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Remove Block Theme Styles From Classic Themes

Stops classic (non-block) themes from loading the global styles, classic theme styles and duotone SVG filters that WordPress adds for block themes, saving inline CSS on every page.

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Code

add_action( 'wp_enqueue_scripts', function () {
    if ( wp_is_block_theme() ) {
        return;
    }

    wp_dequeue_style( 'global-styles' );
    wp_dequeue_style( 'classic-theme-styles' );
    wp_dequeue_style( 'core-block-supports-duotone' );
}, 100 );

add_action( 'init', function () {
    if ( function_exists( 'wp_is_block_theme' ) && ! wp_is_block_theme() ) {
        remove_action( 'wp_body_open', 'wp_global_styles_render_svg_filters' );
        remove_action( 'wp_footer', 'wp_enqueue_global_styles', 1 );
    }
} );

Notes

Only runs on classic themes; check that buttons and colors set in the editor still look right after enabling it.

How to add this snippet

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