url_popup

URL Pop Up (User Registration Link Pop Up) allows site administrators
to attach informational modal links to specific options on User
Registration list fields (List text or List integer field types).

When a user encounters a radio button or select option on the
registration form, a configurable "Find Out More" style link appears
inline next to the option label. Clicking the link opens a modal
dialog with helpful explanatory content — without navigating away
from the registration form.

Use Case

Sites that present registration options which may be unfamiliar to
new users — such as membership types, organisations, or account
categories — can use this module to provide contextual help exactly
where it is needed, reducing registration abandonment and support
requests.

Features

• Admin configuration UI at
  Admin → Configuration → User Interface → URL Pop Up
• Supports multiple entries — different fields, different options,
  each with their own modal
• Targets specific option values on any List (text) or
  List (integer) field on the User entity
• Three modal content types:
  • Full node body — loads a published page into the modal
  • Specific field — displays a single named field from a node
  • Custom text — displays inline text with no page required
• Configurable link label, target path, and modal width per entry
• Built on Drupal core AJAX Dialog API — no external JS dependencies
• Anonymous-access reminder on the target path field, since the
  registration form is shown to unauthenticated users

Requirements

• Drupal 10 or 11
• At least one List (text) or List (integer) field on the
  User entity
• Target pages must be published and accessible to anonymous users

Related Modules

• Field description tooltip — converts field descriptions to hover
  tooltips (different approach, sitewide scope)
• Tooltip Modal Popup — similar concept for provider selectors
  (narrower scope, requires Token module)