ave the edit_css capability.
 *
 * @since 7.0.0
 * @access private
 */
function wp_custom_css_kses_init() {
	wp_custom_css_remove_filters();
	if ( ! current_user_can( 'edit_css' ) ) {
		wp_custom_css_kses_init_filters();
	}
}

/**
 * Initializes custom CSS content filters when imported data should be filtered.
 *
 * Runs at priority 999 on {@see 'force_filtered_html_on_import'} to ensure it
 * fires after general KSES initialization, independently of user capabilities.
 * If the input of the filter is true it means we are in an import situation and should
 * enable the custom CSS filters, independently of the user capabilities.
 *
 * @since 7.0.0
 * @access private
 *
 * @param mixed $arg Input argument of the filter.
 * @return mixed Input argument of the filter.
 */
function wp_custom_css_force_filtered_html_on_import_filter( $arg ) {
	if ( $arg ) {
		wp_custom_css_kses_init_filters();
	}
	return $arg;
}

// Run before wp_filter_global_styles_post (priority 9) and wp_filter_post_kses (priority 10).
add_action( 'init', 'wp_custom_css_kses_init', 20 );
add_action( 'set_current_user', 'wp_custom_css_kses_init' );
add_filter( 'force_filtered_html_on_import', 'wp_custom_css_force_filtered_html_on_import_filter', 999 );

// Register the block support.
WP_Block_Supports::get_instance()->register(
	'custom-css',
	array(
		'register_attribute' => 'wp_register_custom_css_support',
	)
);
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