Change record status: 
Project: 
Introduced in branch: 
9.4.x
Introduced in version: 
9.4.0
Description: 

The drupal.editor.admin and drupal.filter.filter_html.admin now use vanilla JavaScript to achieve the same functionality they once used Underscore for.

The JavaScript within these libraries functions exactly the same as it did prior to this change.

Impacts
The only potential impact is if a site has contrib/custom code that relies on Underscore and expects it to be available because it's loaded as part of drupal.editor.admin or drupal.filter.filter_html.admin

Impacts: 
Module developers