Is a marimo.ui.anywidget with a __format__ spec possible?

[RichardPotthoff]

Here is my problem:

I would like to render a widget differently in different places in the notebook.

A (seemingly) straightforward way would be to add a "dataset.formatSpec" to the "el" element that is passed to the anywidget's "render(model,el)" function.

I have tried to wrap the widget into a <span> element:

class SIUnitInput(mo.ui.anywidget):
    def __init__(self,*args,**kwargs):
        super().__init__(SIUnitInputAnywidget(*args,**kwargs))
    def __format__(self, spec: str) -> str:
        base_html = super().__format__(spec)
        if spec :
           return f'<span data-format-spec="{spec}" >{base_html}</span>'
        else:
           return base_html

I was not able to find this wrapper as a parent of the "el" element passed to anywidget's "render" function:

el.parentElement.parentElement.parentElement=null

el.parentElement.parentElement.outerHTML=

<div class="marimo" style="display: contents;"><div class="contents light"><div style="display: inline-block; margin-top: -3px; line-height: 1; vertical-align: middle;"><div style="display: inline-flex; gap: 1px; align-items: center;"><input type="text" placeholder="Enter value" style="width: 60px; padding: 1px; text-align: right; border: 1px solid rgb(204, 204, 204); background-color: rgb(255, 255, 255); cursor: text;"><select id="si-unit-select-1761071782837-0.06302962795830624" style="padding: 0px; margin: 0px; text-align: left;"><option value="K" style="padding: 1px 0px; margin: 0px; text-align: left;">K</option><option value="°C" style="padding: 1px 0px; margin: 0px; text-align: left;">°C</option><option value="°F" style="padding: 1px 0px; margin: 0px; text-align: left;">°F</option></select></div></div></div></div>

How would I find my wrapper <span> element?

Here is a marimo notebook with my "SIUnitInput" anywidget that could benefit form variable front-end rendering (Currently it used a "dropdown" select element to change the display format):

On GitHub:
https://github.com/RichardPotthoff/Notebooks/blob/SIUnitInput02/SIinput.py

In marimo:
https://marimo.app?src=https://github.com/RichardPotthoff/Notebooks/blob/SIUnitInput02/SIinput.py&mode=read&show-code=false