This page is not a video.

You are not watching a video with a document beside it — the document is what your browser is rendering, right now, frame by frame, and the timing below is part of it. All 3 beats arrived in 5,019 bytes of JSON. That is the part a still frame cannot carry.

The address is the first twelve hex of the document's own hash. Same document, same URL, forever — a changed document is a different link.