Thanks for contacting us!
As for the first question, could you make a demo showing the problem in e.g. jsfiddle? It would be very helpful in finding the source of the error.
As for the second question, the formatter
allows setting the content for the entire tooltip, whereas pointFormatter
sets the content only for its part describing the point. In order for the content to be correctly interpreted as HTML code, the useHTML
option should be used. It's also worth setting stickOnContact
if you want to interact with the button in the custom tooltip's content. For the click
event to work with that button, it must be enabled as described in this article: https://www.highcharts.com/docs/chart-concepts/security
I hope you will find it useful