Most pages provide a storage format for the demo, so you can use the free add-on from Atlassian Confluence Source Editor (or through the bundled in ConfiForms storage editor) to import this configuration into your Confluence and see it in action
To import examples from the storage format on Confluence Cloud please see this page
Please note, all the examples here are provided without any obligation and may or may not be incomplete or may have bugs, and we provide NO SUPPORT for these examples and demos.
Content by label (dynamic)
You will need Storage format editor add-on to work with this code and to configure ContentByLabel macro (could not do it via UI)