There are two ways of adding body classes. The first is to add them in twig, the second is to provide additional classes in mytheme.theme.
Extend the current body class with the following:
{% set body_classes = [ logged_in ? 'user-logged-in', not root_path ? 'path-frontpage' : 'path-' ~ root_path|clean_class, node_type ? 'page-node-type-' ~ node_type|clean_class, db_offline ? 'db-offline', current_path ? 'context' ~ current_path|clean_class, ] %} <body{{ attributes.addClass(body_classes) }}>
In your mytheme.theme add:
function mytheme_preprocess_html(&$variables) { $current_path = \Drupal::service('path.current')->getPath(); $variables['current_path'] = \Drupal::service('path_alias.manager')->getAliasByPath($current_path); }
Then, html.html.twig:
{% set body_classes = [ {{ current_path }} ] %} <body{{ attributes.addClass(body_classes) }}>