Add scale mark to a slider

Hi,
My slider should have a mark on zero position (it can have positive and negative values).
How to add that mark (vertical line) to slider?

Unfortunately, there’s no way to do this. As a possible solution, you can try to set the title, as shown below:

http://docs.webix.com/samples/13_form/05_extras/06_slider_negative.html
http://docs.webix.com/samples/13_form/05_extras/05_slider_title.html

OK, may be I set the title as “|” and shift it down in it’s style?

Yes, it works. It need some tuning, but works.
http://webix.com/snippet/9a607c90