use Jinja's tojson filter

docs/patterns/jquery.rst

@@ -60,27 +60,9 @@ like this:
 .. sourcecode:: html+jinja
 
    <script type=text/javascript>
-     $SCRIPT_ROOT = {{ request.script_root|tojson|safe }};
+     $SCRIPT_ROOT = {{ request.script_root|tojson }};
    </script>
 
-The ``|safe`` is necessary in Flask before 0.10 so that Jinja does not
-escape the JSON encoded string with HTML rules.  Usually this would be
-necessary, but we are inside a ``script`` block here where different rules
-apply.
-
-.. admonition:: Information for Pros
-
-   In HTML the ``script`` tag is declared ``CDATA`` which means that entities
-   will not be parsed.  Everything until ``</script>`` is handled as script.
-   This also means that there must never be any ``</`` between the script
-   tags.  ``|tojson`` is kind enough to do the right thing here and
-   escape slashes for you (``{{ "</script>"|tojson|safe }}`` is rendered as
-   ``"<\/script>"``).
-
-   In Flask 0.10 it goes a step further and escapes all HTML tags with
-   unicode escapes.  This makes it possible for Flask to automatically
-   mark the result as HTML safe.
-
 
 JSON View Functions
 -------------------