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.
安装
npx skills add thedaviddias/Front-End-Checklist --skill video-thumbnailnpx skills add thedaviddias/Front-End-Checklist --skill video-thumbnail -a claude-code -gnpx skills add thedaviddias/Front-End-Checklist --skill video-thumbnail -a codex -ggemini skills install https://github.com/thedaviddias/Front-End-Checklist.git --path skills/video-thumbnailgh skill install thedaviddias/Front-End-Checklist video-thumbnailgit clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist /tmp/thedaviddias__Front-End-Checklist
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/thedaviddias__Front-End-Checklist/skills/video-thumbnail ~/.claude/skills/video-thumbnail # Claude Code
cp -R /tmp/thedaviddias__Front-End-Checklist/skills/video-thumbnail ~/.agents/skills/video-thumbnail # Codex, Cursor, Gemini CLI, Copilot, OpenCode