The question is simple, I am using jinja2 html templates and I am supposed to include {{ url_for('static', filename='img/background.png') }} inside of url(''), inside of style="".
The proble is that there is a quotation mark conflict, because there are two nested ' marks
<body id="body-pd" style="background: url('{{ url_for('static', filename='img/background.png') }}') no-repeat center center fixed; background-size: cover;">
Is there some sort of scape character to be used?
The answer to this problem is also very simple: there's no problem. The Jinja environment (server side) and browser/frontend environment have different lifecycle.
Jinja only sees this part:
{{ url_for('static', filename='img/background.png') }}
It produces a path, e.g. /static/img/background.png and replaces the whole {{ ... }} snippet with it. The frontend environment never sees Jinja-related parts. So there's no quotation mark conflict, because half of them will be eliminated by Jinja on the server side.