[Housekeeping] Investigate use of data-element in docs

[RasmusKjeldgaard]

• I have written a good issue

Describe the housekeeping request

In the cookbook, mainly on the item showcase, we use <data> liberally. I do think it is wrong use of the element, as it should have a value attribute with a machine-readable version of the content in the element.

In a lot of the examples, the data is already machine-readable, and adds no value.

In addition, the missing value appears in automated tests as a accessibility issue for all consuming teams copying our approach.

Are there any additional context?

MDN Docs for data