v10.0.0-beta.12

Beta.12 brings Mux playback to Video.js. The new Mux video component builds on the HLS delegate, generates stream URLs from a playbackId (custom playback domains included), and initializes Mux Data monitoring automatically (#1036); a follow-up corrects Mux Data initialization (#1162).

The HLS media stack matures alongside it. A new native HLS delegate drives playback through the browser’s built-in support, and HLS media now picks between the Hls.js and native paths based on browser support, source type, and your preferPlayback setting (#1154, #1150). HLS media also honors preload: hls.js no longer loads segments eagerly, metadata fetches a minimal buffer, and none defers loading until playback starts (#1125). Fatal Hls.js errors now convert to a standard MediaError with consistent messages and surface as error events (#1164).

When playback fails, the new error dialog shows it. The media-error-dialog element in HTML and the compound ErrorDialog component in React (Root, Popup, Title, Description, Close) open automatically from the player’s error state, stay hidden otherwise, and ship in every skin (#1077).

On the site, ejected skins now output self-contained, copy-pasteable code with real media elements, a player wrapper, and usage examples (#1108, #1127), and hidden skin tabs hydrate correctly (#1137). Under the hood, SPF reactors migrated from WritableState to TC39 Signals (#1112). A batch of fixes rounds out the release: an AbortSignal.any polyfill for Chromium 115 and earlier (#1142), responsive skin improvements (#1129), HTML SSR safety (#1155), and assorted site polish (#1144, #1146, #1147, #1148, #1151).