This is a bug at chartd.co, not in this library.
.png:

https://chartd.co/a.png?w=580&h=180&d0=AeP&d1=9et
.svg:

https://chartd.co/a.svg?w=580&h=180&d0=AeP&d1=9et
When setting ymin and ymax, which results in the y-axis labels showing up, the SVG charts are fine.
This is a bug at chartd.co, not in this library.
.png:https://chartd.co/a.png?w=580&h=180&d0=AeP&d1=9et.svg:https://chartd.co/a.svg?w=580&h=180&d0=AeP&d1=9etWhen setting
yminandymax, which results in the y-axis labels showing up, the SVG charts are fine.