Very strange. With an M1 MacBook Air, the Costa Rica video plays in Safari using rec.709 (non-HDR) and in Chrome with bt.2020 (HDR). Article uses an M1 Mac mini

Very strange. With an M1 MacBook Air, the Costa Rica video plays in Safari using rec.709 (non-HDR) and in Chrome with bt.2020 (HDR). Article uses an M1 Mac mini connected to external monitors so it's a different test but it showed Safari playing bt.2020 (doesn't say anything about Chrome). Seems like it will take time for this all to shake out.