doc = """<!DOCTYPE html>

<html>
  <head>
    <title>Html document</title>
  </head>

  <body>
    <div>
      <h1>H1 Tag</h1>
      <h1 class='class-name'>H1 Tag with class</h1>
      <h1 id='id-name'>H1 Tag with id</h1>
      <p class='class-name'>P tag with class</p>
    </div>
  </body>
</html>"""
Add html_doc.py