Should we accept 'container' everywhere we have xref and yref?

[emmanuelle]

Is there a usecase where we do not want to accept 'container' for xref and yref? One possible use would be to draw a vertical line between two columns of subplots, with x=0.5 and xref='container'.

[alexcjohnson]

I agree 'container' would be nice - in this case though I'd think x would be 'paper' (because that's the coordinate space used to position axes - the difference is 'paper' excludes the margins and 'container' goes all the way to the edges of the div) but yref might be 'container' with y from 0 to 1 so you get a line all the way out including the margins.

[kaymal]

Hi, is there any update about this feature?