Hello,

I would like to ask how you should, in general, detect and manipulate with Pandoc `block` elements. Currently, I am trying to replace `<div class='replace-me'>` tag with `<note>` tag in similar (highly simplified) HTML file:

```.{html}

<html>

<body>

<p> First line. </p>

<div class="replace-me another-class"> This should carry on to converted document. </div>

</body>

</html>

```

I have tried to detect the `<div>` tag, use `walk_block` to get the `<div>` content and put it in `<note>` tag, I also found a code using `:walk` method. Lastly, I tried to convert `<div>` content to simple string and concatenate that in `RawInline` type:

```.{lua}

if elem.t == 'Div' and elem.classes[1] == "replace-me" then
content = pandoc.utils.stringify(elem.content)
return pandoc.RawInline('html', '<note>' .. content.. '</note>')
else
return elem
end

```

But none of that is working. I would like to ask you, how to work in general with `pandoc_walk` or `:walk` (are they the same?) and how to deal with my specific situation?

Thank you very much for any help, I ope that afterwards I will be able to help myself a little bit more :)

Regards Tomas

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