Creative Design & Branding
Video Thumbnail
Use when applies to all `<video>` elements in HTML. The `poster` attribute specifies the URL of an image to show as a placeholder before the video is loaded or played. This is distinct from captions or audio descriptions, which are accessibility requirements. The poster is primarily a UX and performance enhancement, though the lack of a poster can indirectly create a CLS (Cumulative Layout Shift) issue if video dimensions are not declared.
- Publisher / source
- thedaviddias/Front-End-Checklist (found on GitHub top repositories)
- Upstream record
- thedaviddias/Front-End-Checklist
- Version
- Version 1
- Published
- Publication review
- Approved for publication · recorded passed scan 2026-11-03
- Content fingerprint
0e28d6806ff14fd1417f7c2ebe9c0396999ff6a7615e19b7929a93ff15889ead