Plots not shown in HTML export for "vscode+notebook" renderer

[BeaBoh]

Environment data

Version: 1.96.2 (user setup)
OS: Windows 11 Pro
Jupyter extension version: 2025.1.2024121801
Python Expension Version: 2024.22.1

Steps to reproduce

import plotly.express as px
fig = px.scatter(x=[0, 1, 2, 3, 4], y=[0, 1, 4, 9, 16])
fig.show(renderer='vscode+notebook')

!jupyter nbconvert --to html filename.ipynb

Expected behaviour

Plots are visible when exporting to HTML

Actual Behaviour

Plots are shown in the notebook but they are not shown in the HTLM file

Side note: I am aware of microsoft/vscode-jupyter#6999 indeed i am using the solution found in that issue

[gvwilson]

@marthacryan can you please check if this is connected with / fixed by changes in the release candidate?

[marthacryan]

@gvwilson Tried this out on master branch and it looks to still be present. I'm seeing this output when I run the nbconvert command: [NbConvertApp] Converting notebook test-notebook.ipynb to html /Users/marthacryan/micromamba/envs/plotly/share/jupyter/nbconvert/templates/base/display_priority.j2:32: UserWarning: Your element with mimetype(s) dict_keys(['application/vnd.plotly.v1+json']) is not able to be represented.

[marthacryan]

I think this should be fixed by #5096.

[danieleongari]

I'm also experiencing this related problem: I work in VSCode and I can not see the interactive plots in https://nbviewer.org/, despite using "vscode+notebook".

I think this was working before upgrading to version 6: indeed, #5096 mentions as cause #4822 that was part of the 6.0.0 release. Downgrading to plotly<6 solved the issue.

@marthacryan I hope your PR with the fix gets merged soon!