RootInlineBox* RenderSVGText::createRootInlineBox() 
{
    RootInlineBox* box = new (renderArena()) SVGRootInlineBox(this);
    box->setHasVirtualLogicalHeight();
    return box;
}
RootInlineBox* LayoutSVGText::createRootInlineBox()
{
    RootInlineBox* box = new SVGRootInlineBox(*this);
    box->setHasVirtualLogicalHeight();
    return box;
}