Change record status: 
Project: 
Introduced in branch: 
8.0.0
Introduced in version: 
8.0.0-beta10
Description: 

Active menu links class have changed from .active to .is-active. Use the .is-active to style active menu links in CSS.

Before:
#main-menu-links li a.active

After:
#main-menu-links li a.is-active

Impacts: 
Themers