Doesn't work as expected

This feels like it does the exact same thing as asNavFor

whilst I'm dragging surely there second slider should be moving at the same time?

This is form your example codepen

Start with the example CodePen referenced in the issue and reproduce the behavior while dragging the sliders. Compare the observed synchronization with the expected simultaneous movement and with asNavFor; done means the intended behavior is clearly established and the issue is resolved or documented.

Written by the indexing model from the issue text.