Blake Erickson 1b02dce594 DEV: Drop old IE11 intersection-observer references (#12942) ...

It's been awhile since we have supported IE11 so it should be safe to remove
IntersectionObserver now.

From a TODO task in this repo:
> drop when we eventually drop IE11

Announcement of when we removed IE11 support:

https://meta.discourse.org/t/137984/40?u=blake

2021-05-04 17:54:54 -06:00

..

images

DEV: Add SCSS helper to replace asset-uri and image-uri (#12664)

2021-04-12 13:57:39 +10:00

javascripts

DEV: Drop old IE11 intersection-observer references (#12942)

2021-05-04 17:54:54 -06:00

stylesheets

UX: hide the list of file extensions on the upload dialog (#12836)

2021-05-04 15:16:00 +04:00