Products Web Articles by Philipp Legner Software Engineer at Gogole http Santa Tracker as a PWA Santa Tracker is a fun and educational experience for everyone-a holiday tradition here at Google. In 2016, we upgraded the Santa Tracker site to support offline via the Service Worker API. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated January 3, 2018.