Header simple

The summary cannot be used at the same time as the horizontal anchored menu
It can be used on the publication page type only
Will only apply to certain content blocks:
Multi-card
Pictogram card
Text + image (all)
Paragraph (all)
Media (added to the design, portrait and landscape photo/video)
The summary is in a fixed position once the user has scrolled through the first section of the article, and is unfixed when all sections have been scrolled through.
Possibility to add a sub-part to the summary (to be configured from the BO)