-- Convertit les divs avec classes sémantiques en balises HTML5 appropriées
local semantic_tags = {
    ['section'] = true,
    ['article'] = true,
    ['aside'] = true,
    ['nav'] = true,
    ['header'] = true,
    ['footer'] = true,
    ['main'] = true
}

function Div(el)
for tag, _ in pairs(semantic_tags) do
  if el.classes:includes(tag) then
    -- Build attributes (your existing code is good)
    local attrs = {}
    if el.identifier ~= '' then
      table.insert(attrs, 'id="' .. el.identifier .. '"')
      end

      local filtered_classes = {}
      for _, class in ipairs(el.classes) do
        if class ~= tag then
          table.insert(filtered_classes, class)
          end
          end

          if #filtered_classes > 0 then
            table.insert(attrs, 'class="' .. table.concat(filtered_classes, ' ') .. '"')
            end

            for key, value in pairs(el.attributes) do
              table.insert(attrs, key .. '="' .. value .. '"')
              end

              local attr_string = #attrs > 0 and ' ' .. table.concat(attrs, ' ') or ''

              -- THE FIX: Modify and return the content list directly
              -- 1. Prepend the opening tag
              el.content:insert(1, pandoc.RawBlock('html', '<' .. tag .. attr_string .. '>'))
              -- 2. Append the closing tag
              el.content:insert(pandoc.RawBlock('html', '</' .. tag .. '>'))
              -- 3. Return the modified pandoc.List
              return el.content
              end
              end

              -- If no semantic class is found, return the element unchanged
              return el
              end