Proposal: allow simple_tag to parse @/- attributes

[KenWhitesell]

I think this is more likely an issue of nested quotes than of the ability to pass the tag.

All these following work:

{% greetings '@click=" " ' %}

{% greetings '@click=\' \' ' %}

{% greetings "@click=\" \" " %}

{% greetings "@click='  ' " %}