# v10.0.0-rc.2 Released 2026-09-09. Contains breaking changes. [Compare changes on GitHub](https://github.com/videojs/v10/compare/@videojs/core@10.0.0-rc.1...@videojs/core@10.0.0-rc.2) > **Note** > > Pardon the fast follow, with breaking changes. We cut rc.1 just a bit too early. [Check that changelog out](https://videojs.org/changelog/10.0.0-rc.1/) for additional major changes. But this time for real, [we’re excited to announce the Release Candidate of Video.js v10!](https://videojs.org/blog/videojs-v10-release-candidate/) Posters and timeline previews now have room for the layers your player needs, while the surrounding controls behave more reliably as media loads. ## Breaking changes - **React posters use compound parts** ([#2563](https://github.com/videojs/v10/pull/2563)). Replace `` with ``. Move image styling to `media-poster-image`; keep visibility and loading styles on `media-poster`. - **React thumbnails use compound parts** ([#2566](https://github.com/videojs/v10/pull/2566)). Replace `` with ``, and replace `ThumbnailProps` with `ThumbnailRootProps` and `ThumbnailImageProps`. - **React slider thumbnails use compound parts** ([#2568](https://github.com/videojs/v10/pull/2568)). Replace `` with ``. Rename `SliderThumbnailProps` to `SliderThumbnailRootProps`, and pass image props to `Slider.Thumbnail.Image`. - **HTML thumbnails adopt their image child** ([#2572](https://github.com/videojs/v10/pull/2572)). For custom thumbnail markup, provide a native `` inside `` or ``; the thumbnail root now controls that image’s `src` and `srcset`. Without a child, style the fallback through `::part(image)`. ## Composable previews Poster, thumbnail, and slider thumbnail surfaces now separate state from the controlled image. That gives you a stable root for loading state and sizing, plus a place for overlays, blur previews, and other sibling layers. React uses `Root` and `Image` parts, while HTML poster and thumbnail elements adopt an optional light-DOM image and otherwise render a fallback image ([breaking changes](#breaking-changes), [#2563](https://github.com/videojs/v10/pull/2563), [#2566](https://github.com/videojs/v10/pull/2566), [#2568](https://github.com/videojs/v10/pull/2568), [#2572](https://github.com/videojs/v10/pull/2572)). See the Poster reference for [HTML](https://videojs.org/docs/framework/html/reference/components/poster/) and [React](https://videojs.org/docs/framework/react/reference/components/poster/), Thumbnail for [HTML](https://videojs.org/docs/framework/html/reference/components/thumbnail/) and [React](https://videojs.org/docs/framework/react/reference/components/thumbnail/), and timeline previews for [HTML](https://videojs.org/docs/framework/html/guides/thumbnails/) and [React](https://videojs.org/docs/framework/react/guides/thumbnails/). The guide now explains which thumbnail props the slider supplies and which you provide ([#2681](https://github.com/videojs/v10/pull/2681)). ## Controls and skins Before media metadata is available, time-dependent controls now show their unavailable state instead of offering a misleading zero-duration timeline: seeking, live-edge seeking, the time slider, and picture-in-picture wait until they have a usable range ([#2525](https://github.com/videojs/v10/pull/2525)). Held slider keys now advance steadily, stay in range, and keep controls visible for the full press ([#2553](https://github.com/videojs/v10/pull/2553)). Read the Time reference for [HTML](https://videojs.org/docs/framework/html/reference/components/time/) and [React](https://videojs.org/docs/framework/react/reference/components/time/), and LiveButton for [HTML](https://videojs.org/docs/framework/html/reference/components/live-button/) and [React](https://videojs.org/docs/framework/react/reference/components/live-button/) ([#2680](https://github.com/videojs/v10/pull/2680)). The shared skins also tighten narrow-player spacing, keep video controls above captions, and size seek previews responsively ([#2558](https://github.com/videojs/v10/pull/2558)). A finite clipping radius avoids a Safari `clip-path` bug ([#2679](https://github.com/videojs/v10/pull/2679)), and Safari now applies poster and slider-thumbnail styling correctly when those elements host or slot Shadow DOM content ([#2693](https://github.com/videojs/v10/pull/2693)). ## Documentation updates The docs now cover always-visible controls in the [HTML](https://videojs.org/docs/framework/html/guides/controls/) and [React](https://videojs.org/docs/framework/react/guides/controls/) guides, compound React radio-group parts, container-scoped error-dialog modality, and playback-adapter terminology in React hooks ([#2687](https://github.com/videojs/v10/pull/2687), [#2688](https://github.com/videojs/v10/pull/2688), [#2686](https://github.com/videojs/v10/pull/2686), [#2685](https://github.com/videojs/v10/pull/2685)). --- Full changelog: https://videojs.org/changelog/llms.txt All documentation: https://videojs.org/llms.txt