Here is some code which i just lately wrote. I think that it provides a fundamental explanation of mixing class/ID names with pseudoclasses. div p find all p features who are decedent of div element, Whilst div > p decide on only baby p aspects, not grand boy or girl, https://www.presta-addons-modules.com/en/free-modules/prestashop-popup-on-exit-page-on-browser-tab-close-event.html