Chrome 49: Custom CSS properties, background sync and save-data client hint

Chrome 49 adds support for custom CSS properties. Service workers become even more powerful with the ability reliably send data with background sync. And the new save-data client hint header enables you to deliver fast and light applications to users who want them. Pete LePage has all the details and how you can use these new developer features in Chrome 49!
CSS Custom Properties
https://developers.google.com/web/updates/2016/02/css-variables-why-should-you-care
https://drafts.csswg.org/css-variables/
https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_variables

Background Sync
https://developers.google.com/web/updates/2015/12/background-sync
https://github.com/WICG/BackgroundSync/blob/master/explainer.md

Save Data Client Hint
https://developers.google.com/web/updates/2016/02/save-data

Deprecations in Chrome 49
https://developers.google.com/web/updates/2016/02/chrome-49-deprecations