Slider knob not moving with keyboard controls

[unnikrisb]

I am using venturocket angular-slider to do some page-turns of a book. Basically my page is book reader. It's working fine with cursor as well as touch controls.

But now I'm trying to move the slider knob/pointer handle using keyboard controls but I'm not able to.Tried to attach a tab index for knob/pointer handle and focus rectangle was seen on knob/pointer handle. But couldn't move the same.

Is this feature not available for angular-slider?