#include 
#include 
#include 
#include 
#include 
Document::Document()
    : ParentNode(NodeType::DOCUMENT_NODE)
{
}
Document::~Document()
{
}
StyleResolver& Document::style_resolver()
{
    if (!m_style_resolver)
        m_style_resolver = make(*this);
    return *m_style_resolver;
}