edlp_d8/sites/all/modules/examples/ms_ajax_form_example/ms_ajax_form_example.routing.yml

ms_ajax_form_example.page:
  path: '/multi-step-ajax-form'
  defaults:
    _form: '\Drupal\ms_ajax_form_example\Form\MultiStepExampleForm'
    _title: 'Welcome'
  requirements:
    _permission: 'access content'