Treemap subplot in PlotlyJS

[empet]

@stej

fieldsa = Dict{Symbol,Any}(:type => "treemap",
   :labels => ["a", "A"],
   :parents => ["", ""],
   :values => [1, 10],
   :textinfo => "label+value+percent entry")
fieldsb = Dict{Symbol,Any}(:type => "treemap",
   :labels => ["b", "B"],
   :parents => ["", ""],
   :values => [5, 3],
   :textinfo => "label+value+percent entry")

Treemaps are special charts, and when you insert them as subplots, you have to
set domain_x, domain_y as subintervals in [0,1], to inform plotly.js where to locate
each treemap window within the unit square [0,1] x[0,1] (the plotting window).
Here is an example where in each subplot I inserted the same tree (with data from Treemap charts in Python):

using PlotlyJS
tree1= treemap(
    labels = ["Eve","Cain", "Seth", "Enos", "Noam", "Abel", "Awan", "Enoch", "Azura"],
    parents = ["", "Eve", "Eve", "Seth", "Seth", "Eve", "Eve", "Awan", "Eve"],
    root_color="lightgrey",
    domain_x = [0,1],
    domain_y = [0,0.48]
   )

tree2= treemap(
    labels = ["Eve","Cain", "Seth", "Enos", "Noam", "Abel", "Awan", "Enoch", "Azura"],
    parents = ["", "Eve", "Eve", "Seth", "Seth", "Eve", "Eve", "Awan", "Eve"],
    root_color="lightgrey",
    domain_x =[0,1],
    domain_y = [0.52, 1]
   )
data= [tree1, tree2]
layout=Layout(width=700, height=500)
pl = plot(data, layout)