The Chrome Intersection Observers API allows developers to determine when an element in their DOM is visible to the end user. If an element is only partially visible, the API can determine what proportion of it is visible. This could be used to delay loading images until they're needed or to determine whether an end user is actually seeing an ad banner.
Seventeen APIs have been added to the ProgrammableWeb directory in categories including Financial, Art, and Authentication. One highlight is the ReviewTrust API, which enables developers to add confirmation of valid reviews and ratings about products for their users. Here's a look at what's new.