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Hi Sanzhar, If you are using the Plot library, you can use “title” inside a mark to display a value on hover: https://observablehq.com/@observablehq/plot-bar#cell-1005. For a more responsive tooltip that can even be styled, use the addTooltips function with Plot: https://observablehq.com/@mkfreeman/plot-tooltip#cell-64 Is this what you were looking for? On your second question about a chart that is a box with a single number in it, you could use Plot.cell to draw a single cell. You could also make a simple box with a bit of css and html. Both examples here: https://observablehq.com/d/e5345e1f8a9855e7

Thanks Ananya, appreciate it :)