Sawyer Click

Currently it's almost impossible to view tooltips for low value columns. I'd suggest to trigger the tooltip through a transparent (#fff0) rect below each column that spans the max height. You can then set the actual bar to pointer-events:none.

Fabian Iwand

Good suggestion! I've created bars with the height equal to the max yScale, making it easier to select. Also added an option to highlight that background rect element, which gives a nice effect of being able to see how the bar stacks up compared to the max value.