html-explainer: turn any topic into a narrated explainer video
html-explainer is an open-source Agent Skill for Claude Code, Codex and other coding agents: give it a topic and it runs research, narration, voiceover, subtitles, frame-by-frame rendering and covers end to end, producing a hard-subtitled MP4. Scenes are written in HTML/CSS/GSAP and rendered with a deterministic seek renderer, so audio and animation stay locked in sync. The default edge-tts voiceover is free and everything runs locally.