Plugin installs: Before setup or freshness commands, follow plugin execution rules when this skill is inside a HyperFrames plugin.

HyperFrames slideshow

A slideshow is a normal composition (the /hyperframes contract applies) plus one JSON island that says which scenes are slides and how they connect. The deliverable is a running deck, not an MP4.

What changes from a video project

• Each slide is a top-level scene in the composition file: data-composition-id, data-start, data-duration, data-label, data-width, data-height. There is no master root composition wrapping them.
• One island per composition, near the top of <body>, written in the HTML (never generated by script; present reads the file statically):

<script type="application/hyperframes-slideshow+json">
  {
    "slides": [
      { "sceneId": "hook", "notes": "Pause on the number." },
      {
        "sceneId": "problem",
        "fragments": [11.0, 15.0],
        "hotspots": [
          {
            "id": "h1",
            "label": "Where does $40B come from?",
            "target": "market-detail",
            "region": { "x": 55, "y": 60, "w": 40, "h": 20 }
          }
        ]
      }
    ],
    "slideSequences": [
      { "id": "market-detail", "label": "Market sizing", "slides": [{ "sceneId": "mkt-math" }] }
    ]
  }
</script>

• sceneId equals a scene's data-composition-id (or give startTime/endTime). notes are presenter-only. ttsScript, ttsAudioUrl and ttsDurationMs are reserved and not wired yet.
• Fragments are absolute timeline times (the same clock as data-start, not offsets inside the slide) within the slide's [start, end]. Navigation seeks, it never plays: each hold state must look right when the timeline is seeked straight to that time. A slide without fragments enters at a rest frame inside it.
• Branch slides are ordinary scenes listed only in slideSequences, never in the main slides array. A hotspot's target is a sequence id; region is a percentage box (omit it for a full-slide button). Back returns to the slide that held the hotspot.
• Text the audience must read is at least 40 px at 1920×1080. Before hand-building any named visual, search npx hyperframes catalog --query "<the visual, in English>" --json: it ranks the whole registry with nothing installed.

Porting an existing page

• Keep the source's look, motion, interactions and media behaviour; port its widgets, players and visualizers rather than approximating them.
• Movement the page drove by scroll, wheel or a camera layer becomes a camera move from one focal point to the next on slide navigation, never a page visibly scrolling. Keep each move direct, without reversals the source doesn't make.
• Screenshots, posts, charts, code and any image with readable text are evidence: keep their aspect (object-fit: contain) and check all four edges for crops.
• Every copied <video>/<audio> needs data-start and data-duration (data-has-audio="true" when its sound plays), and no preload="none". Custom media chrome reads the native element's events and currentTime, never its own timer.
• Hidden stacked slides need opacity: 0, visibility: hidden and pointer-events: none together, or an invisible layer swallows clicks.

Present and hand off

• Never render a deck to MP4: render keeps only the first scene and truncates silently. For stills, snapshot --at each slide.
• Run npx hyperframes check --json until it is clean. The slideshow rule checks that every sceneId resolves, every hotspot target exists, fragments sit inside their slide, and main-line slides don't overlap.
• Serve it with npx hyperframes present <project-dir> and hand over the URL it prints: "Click Present, or press P, to open the audience tab."
• The project's root index.html should open as a working deck: <hyperframes-slideshow> around <hyperframes-player src="…">, with the raw composition in a subfolder if needed. The component owns Present (P), Prev/Next, the counter, global mute, fullscreen, swipe, hotspots, presenter notes (editable, kept per deck) and stopping media on slide exit. Don't build your own versions of any of these.
• Screen sharing: in Google Meet share the audience tab, which keeps rendering in the background. In Zoom drag the audience tab into its own window and share that; a fully covered window freezes.
• A deck opened from the bare player bundle without present needs workarounds: references/standalone-harness.md.