Contours width has no effect

[mmikhasenko]

No sure where the report belongs, so duplicating discussion in JuliaPlots/Plots.jl#3127 here

width should be valid property of contours.

It does not seem to have any effect,

MWE

using PlotlyJS
using WebIO

begin
	# Define grid
	x = range(-1, 1, length=100)
	y = range(-1, 1, length=100)
	z = [abs2(xi + 1im * yi) for yi in y, xi in x]  # note: Plotly expects z as rows = y, cols = x
end

# Create surface trace
trace = surface(
    x = x,
    y = y,
    z = z,
    showscale = false,
	contours = attr(
        z = attr(
            show = true,
            color = "white",
            width = 16,
        )
    )
)

savefig(
	plot(trace, Layout(scene = attr(xaxis = attr(visible=false),
                                yaxis = attr(visible=false),
                                zaxis = attr(visible=false)))),
		"test.png")

Versions:

Please provide the following:

1. output of julia command versioninfo()

Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 8 × Apple M3
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, apple-m2)
Threads: 4 default, 0 interactive, 2 GC (on 4 virtual cores)
Environment:
  JULIA_REVISE_WORKER_ONLY = 1

3. using Pkg; Pkg.status(): PlotlyJS v0.18.16