1<script src="{{url_for('static', filename='somejavascriptfile.js')}}"></script>
2

1<!-- Put in HTML file--> 
2
3<!-- 
4JS
5parent_dir is reletive to Flask app.py dir
6meaning: /main/app.py
7		 /main/parent_dir/file.js
8-->
9<script src="{{url_for('parent_dir', filename='file.js')}}"></script>
10
11<!-- 
12CSS
13parent_dir is reletive to Flask app.py dir
14meaning: /main/app.py
15		 /main/parent_dir/file.css
16-->
17        <link href="{{ url_for("parent_dir",filename="file.css")  }}" rel="stylesheet">

1<script src="{{url_for('static', filename='js/modernizr-2.6.2.min.js')}}"></script>