У вашего броузера проблема в совместимости с HTML5
sources:
used two quotes/data from book
http://www.nytimes.com/1994/06/01/us/cause-of-cystic-fibrosis-is-traced-to-the-stone-age.html
https://ghr.nlm.nih.gov/condition/cystic-fibrosis#statistics
https://www.verywell.com/genetics-of-cystic-fibrosis-998211
https://www.childlifesociety.org/what_causes_cf.php
https://www.webmd.com/children/tc/cystic-fibrosis-exams-and-tests