What version of html does Confluence support?

[Sasha Morozevich]

I am using the confluence api to create a confluence page from html embedded in json (see example code at bottom)

I can create confluence pages successfully using simple html (e.g. <p>Hello, World</p>) but as soon as I venture to more complex html, I receive internal server errors (http 500 response)

What version of html does Confluence support? It's obviously not HTML5...it doesn't even support the <!DOCTYPE> tag)!

data = f'{{"type":"page", "title":"{TITLE}", "space":{{"key":"{SPACE}"}}, "body":{{"storage":{{"value":"{BODY}", "representation":"storage"}}}}}}}}'
headers = {'Content-Type': 'application/json'}
res = requests.post(URL, auth=(USERNAME, PASSWORD), data=data, headers=headers)

[Sasha Morozevich · Accepted solution]

The answer is Confluence uses XHTML Storage Format, which is not even HTML.  In fact, it more resembles XML but shares some overlap with HTML hence examples like <p> Hello, World </p> render correctly.

[Sasha Morozevich]

No one knows the answer?  You'd expect there to be some documentation somewhere...

[Sasha Morozevich]

@Nicolas Grossi 

I believe the version of confluence I am using is near the latest (7.19.1).

I don't believe I use any macros.  So if I install an html5 macro, confluence will magically render html5 finally?  Or is there any more work to do?