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WP's default Gutenberg editor is an intuitive, yet highly flexible page editor that exists as an independent open-source project, and has meanwhile matured and become popular, with integration into Drupal as well.
Check this microsite: https://campaigns.tieto.com/intelligentwellbeing . Please scroll down to the bottom. It's a single node. For those who are not familiar with the Drupal content management system a node is something like an article. This whole onepage-site with its menu and all the sections is 1 node.