WP_Plugin_Install_List_Table::get_table_classes()

Return

(array)

Source

File: wp-admin/includes/class-wp-plugin-install-list-table.php 

protected function get_table_classes() {
		return array( 'widefat', $this->_args['plural'] );
	}

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https://developer.wordpress.org/reference/classes/wp_plugin_install_list_table/get_table_classes