Who placed the item. Drives the ownership chrome (chips / violet vs slate-amber).
The widget's full HTML source (becomes the sandboxed iframe's srcdoc).
Stable item id (e.g. sticky-3) — referenced by connectors, deltas and agent tools.
OptionalTitleOptional title shown on the widget's header bar.
Render order (higher renders on top). Assigned by the engine.
An interactive HTML widget — arbitrary HTML (scripts included) rendered inside a STRICTLY SANDBOXED iframe (
sandbox="allow-scripts"only, opaque origin — see the board component for the full security rationale). Dragged/selected by its card chrome — header bar, border ring and lazy placeholder — while pointer events inside the sandboxed frame stay with the widget, so iframe interactivity and board interactions coexist.