Confluence: Using HTML-Tags

As in my previous question described, I got an 400 Error in my Confluence response. The problem was, that I was using HTML-Tags like ‘’ in the body. This is described in the documentation of the atlassian-python-api.
My code looks as follows:

from atlassian import Confluence

confluence = Confluence(
    url='http://localhost:8090',
    username='admin',
    password='admin')

status = confluence.create_page(
    space='DEMO',
    title='This is the title',
    body='This is the body. You can use <strong>HTML tags</strong>!')

print(status)

Therefore I wanted to know, if the HTML-Tags aren’t supported anymore or if I am missing some major point ?