Change record status: 
Project: 
Introduced in branch: 
8.0.x
Description: 

The system status report has been made into a CSS component in Drupal 8.

As a result there are a couple of new classes.

Drupal 7
.system-status-report .status-icon
Drupal 8
.system-status-report__status-icon

Drupal 7
.status-icon status-icon--{{ requirement.severity_status }}
Drupal 8
.system-status-report__status-icon--{{ requirement.severity_status }}

Drupal 7
.system-status-report .status-icon--error
Drupal 8
.system-status-report__status-icon--error

Drupal 7
.system-status-report .status-icon--warning
Drupal 8
.system-status-report__status-icon--warning

Drupal 7
.system-status-report .status-title
Drupal 8
.system-status-report__status-title

A new class has also been created to reference each entry of the system status report table:

Drupal 7
<tr>
Drupal 8
<tr class="system-status-report__entry">

Impacts: 
Themers