Missing Text Elements (e.g. Title, and Legends) when exporting as HTML

[sssilvar]

Describe the bug

Title, text, and label elements are not visible when exporting to HTML, either from the server or using pyvista.Plotter.export_html. The same issue occurs with vtksz, from which as far as I understood the HTML is generated.

To Reproduce

Steps to reproduce the behavior:

1. Run the provided script.
2. Open Served app (text elements will be present).
3. Export as HTML.
4. Observe that the title, text, and legend labels are missing.

⚠️ Can also be reproduces with pyvista.Plotter.export_html.

Code

"""Script to report bug - text elements not showing on HTML exports."""

import pyvista as pv
from pyvista import examples
from pyvista.trame.ui import plotter_ui
from trame.app import get_server
from trame.ui.vuetify3 import SinglePageLayout

pv.OFF_SCREEN = True


server = get_server()
state, ctrl = server.state, server.controller
mesh = examples.load_random_hills()

pl = pv.Plotter()
pl.add_mesh(mesh, label="mesh")
pl.add_text("My Sphere Plot", position="upper_edge", font_size=24, color="black")
pl.add_legend()

with SinglePageLayout(server) as layout:
    with layout.content:
        view = plotter_ui(pl)

if __name__ == "__main__":
    server.start()

Expected behavior

The exported HTML should include all text elements, including the title, text annotations, and legend labels.

Screenshots

Served app (or pyvista.Plotter.show():

Exported HTML:

** Environment **

--------------------------------------------------------------------------------
  Date: Fri Feb 07 11:42:30 2025 CET

                  OS : Darwin (macOS 15.2)
              CPU(s) : 8
             Machine : arm64
        Architecture : 64bit
                 RAM : 16.0 GiB
         Environment : Python
         File system : apfs

  Python 3.10.15 (main, Dec  5 2024, 12:36:43) [Clang 16.0.0
  (clang-1600.0.26.4)]

             pyvista : 0.44.2
                 vtk : 9.3.1
               numpy : 1.24.4
          matplotlib : 3.9.3
              scooby : 0.10.0
               pooch : 1.8.2
              pillow : 11.0.0
             IPython : 8.30.0
               scipy : 1.14.1
                tqdm : 4.67.1
               trame : 3.8.0
        trame_client : 3.5.2
        trame_server : 3.3.0
           trame_vtk : 2.8.14
       trame_vuetify : 2.8.1
        nest_asyncio : 1.6.0
--------------------------------------------------------------------------------

Platform:

Device:

• [x] Desktop
• [x] Mobile

OS:

• [ ] Windows
• [x] MacOS
• [ ] Linux
• [ ] Android
• [ ] iOS

Browsers Affected:

• [x] Chrome
• [x] Firefox
• [x] Microsoft Edge
• [x] Safari
• [x] Opera
• [x] Brave
• [x] IE 11

[jourdain]

Thanks for the report, but that is a known limitation of vtk.js.

See https://github.com/Kitware/trame-vtk/issues/67