Support for Drupal 7 is ending on 5 January 2025—it’s time to migrate to Drupal 10! Learn about the many benefits of Drupal 10 and find migration tools in our resource center.
Besides this two things, we also need to implement this hack: https://github.com/PolymerElements/iron-form/issues/105 , in order to get iron-form working with Drupal
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skyredwang