The Mozilla Intersection Observer API allows developers to observe changes in how a target element intersects with an ancestor element or viewport. Developers can configure a callback that will be called whenever a target intersects with either the device viewport or another specified element. This specification is still being worked on and is therefore subject to change.
We've added 11 APIs to the ProgrammableWeb directory in categories including Government, Astronomy, and Browsers. A highlight today is the Facebook Instant Articles API, which enables content providers to automatically publish articles within Facebook. Here's a rundown of the latest additions.