The browser you install now plays video, built entirely from its own code

The browser could already work out video pictures on its own for a few releases, and had been checked to be exactly right - but that ability leaned on a large outside video library, and the version people actually install was built without it. So on your copy, a video on a page showed nothing but its still poster image. This release closes that gap: the browser now plays moving video for the first time, built entirely from its own code with no outside library involved. The picture moves in real time as the clip runs, and it is checked to be exactly right, frame for frame, against the standard reference - a browser deciding what a video looks like entirely by itself, the same by-itself, repeatable quality that makes the page-proof features possible, now extended to moving pictures. This is real, from-scratch video for the common web format, and it is why the overall score moves 57 to 58 - one of the big under-the-hood pieces the score waits on has genuinely begun to land. Honest scope: a few less-common video formats and the sound track still use an optional add-on, so a page that needs those falls back exactly as it did before, and longer clips are the next step.