Linechart tootltip data is static When a Notebook is Embedded

[mcollie1]

I've used the addTooltip function in a notebook. While in the Notebook directly, data updates as one hovers over different points a the line. However, data becomes static when embedding the notebook.

https://observablehq.com/@mkfreeman/plot-tooltip

[harshagarwalnyu]

The addTooltip community notebook uses custom pointer-event listeners attached to the document that don't transfer correctly into cross-origin iframes (embedded notebooks). The tooltip gets initialized but the hover events never fire in the embedding context.

Fix: use Plot's built-in tip mark (added in Plot 0.6.7) instead of the community addTooltip function:

Plot.plot({
  marks: [
    Plot.line(data, {x: "date", y: "value"}),
    Plot.tip(data, Plot.pointerX({x: "date", y: "value"}))
  ]
})

The native tip mark attaches events directly to the SVG element rather than the document, so it works correctly in iframes and embedded contexts.

If you must keep addTooltip: ensure the embedded iframe has allow="pointer-events" and the host page's CSP permits it. But the built-in tip mark is the correct long-term solution — addTooltip was a community workaround before the tip mark existed.