Thank you for your answer.
Still, how does that help me?
When the plugin author changes css classes, I have 3 choices:
- to update the plugin and change all css files
- not update the plugin
- switch to different plugin
I always want to keep all plugins updated to the most current version for safety reasons. So, only 2 choices left. I opted to switch plugin and was glad I had been running slick slider on only few websites.