import pyvista as pv
cone = pv.Cone(height=1.6, radius=0.5, resolution=7, direction=(0.0, 1.0, 0.0))
plotter = pv.Plotter()
plotter.add_mesh(
    cone,
    color="red",
    show_edges=True,
    edge_color="black",
    edge_opacity=0.2,
    line_width=6,
)
plotter.export_html("edge_opacity_doesnt_work_in_vtk_js.html")