Change record status: 
Project: 
Introduced in branch: 
8.8.x
Introduced in version: 
8.8.0
Description: 

The option to open a browser window from the command line to display test results is deprecated in Drupal 8. Use --verbose to display results in the CLI instead.

If you were using this option to access the html generated during a test you can enable the \Drupal\Tests\Listeners\HtmlOutputPrinter in your phpunit.xml file. See core/phpunit.xml.dist for more information.

Impacts: 
Module developers
Themers
Site templates, recipes and distribution developers