Maybe better to be ele.cssLabel() ext than a renderer

[maxkfranz]

Along the same lines as #1, it may be better to be an element extension (i.e. function). That way, you can say explicitly which elements you want to use this. It also means that you can safely turn off regular labels using a bypass style (i.e. ele.css('min-zoomed-font-size', 9999999). Then you can read other label style properties as normal to render the labels with CSS.

[maxkfranz]

It may be better to use a different property than min-zoomed-font-size in future, but it should work for now until a better property is added in cy.js.

[utensil]

@maxkfranz The difficult part of doing this as an element extension might be (correct me if I misunderstood something) how to feedback the size changing to layout engine.