Simulate color blindness in your web browser.
https://chrome.google.com/webstore/detail/rgblind/kjlmmjnmmlfamgddfglhaoklpjjplbhc
http://www.ghacks.net/2017/03/02/run-color-blindness-tests-on-your-websites/
origin - http://www.pipiscrew.com/?p=6964 run-color-blindness-tests-on-your-websites