Problem/Motivation
Adopting the naming conventions defined at "CSS codings standards for Drupal 8" to layout classes
Proposed resolution
The layout classes core applies to the body tag should be updated appropriately.
.sidebar-first
.sidebar-last
.no-sidebars
.two-sidebarsshould be...
.l-sidebar-first
.l-sidebar-last
.l-no-sidebars
.l-two-sidebarsUser interface changes
Not applicable
API changes
Not applicable