http://xperiments.es/blog/en/inyectando-xml-con-formato-dentro-de-javascript/

window.parseEmbeds.js

var html =
<form>
    <input type="text">
</form>;




var data = function()
{
    /*!
    {"embed":{ "id":"form" } }
    <form>
        <input type="text" name="user"/>
        <input type="text" name="password"/>
    </form> 
    */

    /*!
    {"embed":{ "id":"button"} }
        <button value="Send">
    */                  
}
var parsedData = window.parseEmbeds(data);
alert( parsedData.form )
alert( parsedData.button );




(function(window)
{
    window.parseEmbeds = function( fn, opt )
    {   
        var dataObj = {}
        var regex_comments = /\*(.|[\r\n])*?\*/gi;
        var code = fn.toString().match( regex_comments );
        var comment;
        var lines;
        var outputString;
        var trim11 =function(str){str = str.replace(/^\s+/, '');for (var i = str.length - 1; i >= 0; i--) {if (/\S/.test(str.charAt(i))) {str = str.substring(0, i + 1);break;}}return str;};
        for( var i=0; i<code.length; i++ )
        {   
            comment = code[ i ];
            if( comment.indexOf('{"embed":')!=-1 )
            {
                lines = comment.split('\n');
                outputString = "";
                for( var e=2; e
    <lines.length-1; e++ )
                {
                   outputString+=trim11(lines[e]); 
                }
                dataObj[ JSON.parse( lines[ 1 ] ).embed.id ] = outputString;
            }
        }
        return dataObj;
    }
})(window);