id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
613579881,MDU6SXNzdWU2MTM1Nzk4ODE=,4041,expanded HTML repr when opening notebook,2448579,closed,0,,,16,2020-05-06T20:06:38Z,2020-05-20T17:06:40Z,2020-05-20T17:06:40Z,MEMBER,,,,"When I open a notebook, the new HTML repr is ""expanded"": 

![image](https://user-images.githubusercontent.com/2448579/81222973-bc1bd200-8fd4-11ea-8afb-84d706ae9b56.png)

I'm running
```
jupyter core     : 4.6.3
jupyter-notebook : 6.0.3
qtconsole        : 4.7.2
ipython          : 7.13.0
ipykernel        : 5.2.0
jupyter client   : 6.1.2
jupyter lab      : 2.1.0
nbconvert        : 5.6.1
ipywidgets       : 7.5.1
nbformat         : 5.0.4
traitlets        : 4.3.3
```
and see this behaviour with both the notebook and jupyterlab interface; on both chrome and firefox (both on linux).

Is anyone else seeing this?
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