The BBC is slowly moving away from Adobe's Flash plugin for iPlayer. The company has rolled out HTML5 playback support for those who'd prefer to test out the arguably more secure platform. While the BBC will provide the choice between the two options, it has noted that Flash will not be removed completely.
The new player is supported on most modern browsers, including Google Chrome, Firefox, Opera, Microsoft Edge, as well as Safari on iOS. The team behind the implementation will work through the next few months to improve the HTML5 player to match the capabilities of the Flash counterpart.
If you wish to opt-in the beta, you'll need to head to this webpage, after which you should see a HTML5 banner on the video player alerting you that you're now part of the test phase.