Products Web Articles by Marc Cohen Eng Manager, Web Developer Relations http Offline Storage for Progressive Web Apps Learn how to store data locally for improved response time and offline support. Web Storage Overview Performance Observer: Efficient Access to Performance Data The W3C Performance Timeline specification defines an interface for browsers to provide programmatic access to low level timing data. This opens the door to some interesting use cases like custom performance analysis, third party tools and more. 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.