The “Sandbox” space makes available a number of resources that utilize and explore the data underlying "Secrets of Craft and Nature in Renaissance France. A Digital Critical Edition and English Translation of BnF Ms. Fr. 640" created by the Making and Knowing Project at Columbia University.
For example, the use of section separators in https://cu-mkp.github.io/sandbox/docs/su21_fox_mackenzie_final-project-disorganization.html where it is a series of escaped underscores -- this renders as a small straight line but is not meaningful and possibly not ADA compliant - they would likely be read by a screen-reader literally ("dash, dash, dash")