Line 1, Column 39: Element head is missing a required instance of child element title.
<!DOCTYPE html><header id="top_header">
Content model for element head:
If the document is an iframe srcdoc document or if title information is available from a higher-level protocol: Zero or more elements of metadata content.
Otherwise: One or more elements of metadata content, of which exactly one is a title element.
Line 16, Column 15: End tag header seen, but there were open elements.
Line 4, Column 33: Unclosed element section.