IAB Tech Lab took over the OpenVV initiative in 2015 and has maintained the project with continuous updates. The original version was based on Flash technology but the industry has largely migrated to HTML5 Video.
Although we added functionality to support HTML5 in the past, the core libraries were designed for Flash and there was a clear need to build a new version based on HTML5 and recently introduced browser features like Intersection Observer.
Today, the Open VV working group is happy to release the beta version of Open VV for HTML5 video advertising for testing and public comments. The library provides viewability measurement in Javascript and uses Intersection Observer by default, but other measurement techniques can be configured.