Styling GraphStream graph - size-mode appears to be ignored

[Andrew Curtis-Black <acu27 AT uclive.ac.nz>]

Hi,

I’m using the stylesheet reproduced below. The on-click property seems to be working fine, but the size-mode property appears to be ignored. I’m expecting something along the lines of this example from the GS CSS reference:

node {

    size-mode: fit;

}

node:clicked {

    fill-color: red;

}

What obvious thing am I doing wrong?

Many thanks, Andrew