text: {
    "name": "lowercase tags",
    "options": {},
    "html": "<!DOCTYPE html><HTML><TITLE>The Title</title><BODY>Hello world</body></html>",
    "expected": [
      {
        "name": "!doctype",
        "data": "!DOCTYPE html",
        "type": "directive"
      },
      {
        "type": "tag",
        "name": "html",
        "attribs": {},
        "children": [
          {
            "type": "tag",
            "name": "title",
            "attribs": {},
            "children": [
              {
                "data": "The Title",
                "type": "text"
              }
            ]
          },
          {
            "type": "tag",
            "name": "body",
            "attribs": {},
            "children": [
              {
                "data": "Hello world",
                "type": "text"
              }
            ]
          }
        ]
      }
    ]
  }