Inserting attributes into elements

[H <agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org>]

Continuing my quest to write a custom filter, I now ran into a need to add attributes to different types of tags as exemplified below:

- In header tags such as <h2>, I need to add "style=color: #112233;" so it becomes <h2 style="color: #112233;">.

- I analogously also need to add style information to <image> tags.

In my filter I tried:

style_h2 =

if (el.level == 2) then
    local attr = el.attributes
    attr.insert = style_h2
end

but ended up with the below in my html output:

<h2
data-insert=" style=&quot;text-transform: uppercase; color: #cc002b;&quot;">

Clearly not the correct way. Can I add the style information as above in a filter, in the pandoc function as I am going through my document block-by-block and modifying the document structure as needed? I already adding <div> with various style information as I iterate over the blocks and that works fine but now I need to modify existing tags.

I guess I could do it similarly to below but then it applies to all eg H2:

function Header(el)
    --    remove header identifier for all levels
    el.identifier = ''

    --    convert level 1 and 2 to upper case
    if (el.level == 1) or (el.level == 2) then
        return el:walk {
            Str = function(el)
                return pandoc.Str(text.upper(el.text))
            end
        }
    else
        return el
    end
end

How to do it on individual H2 in a filter?

Thanks.

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