GNU General Public License information is in src/site/assets/js/smartbanner/LICENSE.md
SmartBanner JS mimics the iOS Safari mobile app promotional banners for non-Safari-iOS and Android browsers.
To avoid Content Security Policy issues (Postmortem) in staging and production, the SmartBanner code is implemented directly in src/site/assets/js/smartbanner.
SmartBanner JS styles are in src/site/sass/style.scss.