What is <%= ... %>
===

**For example:**

    <input id="wineId" name="id" type="text" value="<%= id %>" />

I know it is printing the value of a JSON string id attribute ( i.e. {id:100} ).  But I am not finding any documentation on it, or even my Google-Fu can't find it.  [This SO post][1] assumes it is a Microsoft `Response.write()` method but I found it in a context having nothing to do with Microsoft code. 

I was reading about [backbone.js][2] in general, this [four-part backbone tutorial by Christophe Coenraets][3] specifically and [this particular page (line 4) ][4] particularly. 

I've searched the "developer.mozilla.org" site under both html and javascript docs looking for it.  Am I blind?  Any help greatly appreciated!


  [1]: http://stackoverflow.com/questions/2201567/asp-net-what-is
  [2]: http://backbonejs.org/
  [3]: https://github.com/ccoenraets/backbone-cellar/tree/master/tutorial
  [4]: https://github.com/ccoenraets/backbone-cellar/blob/master/tutorial/final/tpl/wine-details.html