How to use the _textOverflow_ property in a mark’s implicit _tip_?

[mwaibel-go]

The tip mark’s documentation says:

These standard text options control the display of text within the tip:
[…]

• textOverflow - how to wrap or clip lines longer than the specified line width

The linked text options specify:

The following text-specific constant options are also supported:
[…]

• lineWidth - the line width in ems, for wrapping; defaults to Infinity
• textOverflow - how to wrap or clip lines longer than the specified line width

This leads me to assume that the following plot should only show the last few characters of the dates in the tooltip

Plot.plot({
  marks: [
    Plot.dot(gistemp, {x: "Date", y: "Anomaly"}),
    Plot.tip(gistemp, Plot.pointer({x: "Date", y: "Anomaly", lineWidth:7, textOverflow: 'ellipsis-start'}))
  ]
})

However, it seems that no matter what value I specify for textOverflow, the result is always equivalent to ellipsis-end:

If I don’t specify a textOverflow at all, the tooltip is rendered the same way, even though the text options say (emphasis mine)

If a lineWidth is specified, input text values will be wrapped as needed to fit while preserving existing newlines.

[Fil]

The explanation is given above: "When using the title channel, the tip mark wraps text". Could we have a better copy where we say "input text values"?

[mwaibel-go]

Ok, that info is very far away from the Tip options section 😅. It might be worth repeating it:

- These [standard text options](https://observablehq.github.io/plot/marks/text#text-options)
- control the display of text within the tip:
+ These [standard text options](https://observablehq.github.io/plot/marks/text#text-options)
+ control the display of text within the tip when it is provided via the _title_ channel: