Close all notifications button

[andybroomfield]

Noticing this on a few localgov drupal sites, notably Cumberland where they have a close all notifications button.

They embed this in the last alert banner, so it's reusing the link.
Should we support this officially, with a dedicated link at the bottom / top of all alerts?
We'd need to handle cases where some alerts need to be pernament (can't be hidden).

[andybroomfield]

Better screenshot from Cumberland home page demonstrating two banners and single close button.

and video showing close all alerts, and them staying closed.

Cumberland.close.all.alert.banners.mp4.mp4

I see the following cookie

hide-alert-banner-token|alert---31da2a6697112e4ee1216b979072ef63d400894d+alert-19--b668ea97241adb664611039ce3cafc38ea50c468

so it looks like its still using the same hiding behaviour, just triggering it for all visible alert banners (effectivly like clicking hide on each one). So new banners would I presume still show.

[andybroomfield]

The template and code in use is here
https://gitlab.com/rohallion-public/cumbria-unitary-theme/-/blob/master/templates/block/localgov-alert-banner.html.twig

This also relates to #263